diff --git a/.gitignore b/.gitignore
index 2750f8ee..5a3d3501 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,7 @@ __pycache__/
 *.pyc
 
 *_env/
-.venv/
+.venv*/
 
 online_resources_site/site/
 
diff --git a/chapter_16/mapping_global_datasets/eq_explore_data.py b/chapter_16/mapping_global_datasets/eq_explore_data.py
index 271bde6a..b39a6745 100644
--- a/chapter_16/mapping_global_datasets/eq_explore_data.py
+++ b/chapter_16/mapping_global_datasets/eq_explore_data.py
@@ -4,7 +4,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_1_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/eq_world_map.py b/chapter_16/mapping_global_datasets/eq_world_map.py
index 1902b652..d59236e9 100644
--- a/chapter_16/mapping_global_datasets/eq_world_map.py
+++ b/chapter_16/mapping_global_datasets/eq_world_map.py
@@ -6,7 +6,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_30_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_0_first_version.py b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_0_first_version.py
index ce187d43..e5780a25 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_0_first_version.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_0_first_version.py
@@ -4,7 +4,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_1_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Create a more readable version of the data file.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_1_list_all_earthquakes.py b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_1_list_all_earthquakes.py
index d5b33a85..af9a1725 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_1_list_all_earthquakes.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_1_list_all_earthquakes.py
@@ -4,7 +4,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_1_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_2_extract_magnitudes.py b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_2_extract_magnitudes.py
index 342031e5..cbaa60d4 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_2_extract_magnitudes.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_2_extract_magnitudes.py
@@ -4,7 +4,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_1_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_3_extract_location_data.py b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_3_extract_location_data.py
index 271bde6a..b39a6745 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_3_extract_location_data.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_explore_data_3_extract_location_data.py
@@ -4,7 +4,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_1_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_0_first_version.py b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_0_first_version.py
index fdd83591..07ba2e8a 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_0_first_version.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_0_first_version.py
@@ -6,7 +6,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_1_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_1_representing_magnitudes.py b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_1_representing_magnitudes.py
index a6e0568b..5988d883 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_1_representing_magnitudes.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_1_representing_magnitudes.py
@@ -6,7 +6,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_30_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_2_custom_marker_colors.py b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_2_custom_marker_colors.py
index ae1420ec..f5d75d8f 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_2_custom_marker_colors.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_2_custom_marker_colors.py
@@ -6,7 +6,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_30_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_3_adding_hover_text.py b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_3_adding_hover_text.py
index 1902b652..d59236e9 100644
--- a/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_3_adding_hover_text.py
+++ b/chapter_16/mapping_global_datasets/partial_programs/eq_world_map_3_adding_hover_text.py
@@ -6,7 +6,7 @@
 
 # Read data as a string and convert to a Python object.
 path = Path('eq_data/eq_data_30_day_m1.geojson')
-contents = path.read_text()
+contents = path.read_text(encoding='utf-8')
 all_eq_data = json.loads(contents)
 
 # Examine all earthquakes in the dataset.
diff --git a/chapter_17/hn_submissions.py b/chapter_17/hn_submissions.py
index 7477226e..e6ae1950 100644
--- a/chapter_17/hn_submissions.py
+++ b/chapter_17/hn_submissions.py
@@ -12,7 +12,7 @@
 submission_ids = r.json()
 
 submission_dicts = []
-for submission_id in submission_ids[:5]:
+for submission_id in submission_ids[:30]:
     # Make a new API call for each submission.
     url = f"https://hacker-news.firebaseio.com/v0/item/{submission_id}.json"
     r = requests.get(url)
diff --git a/chapter_17/python_repos.py b/chapter_17/python_repos.py
index b480a811..e7bb11be 100644
--- a/chapter_17/python_repos.py
+++ b/chapter_17/python_repos.py
@@ -21,7 +21,6 @@
 
 print("\nSelected information about each repository:")
 for repo_dict in repo_dicts:
-    print("\nSelected information about first repository:")
     print(f"Name: {repo_dict['name']}")
     print(f"Owner: {repo_dict['owner']['login']}")
     print(f"Stars: {repo_dict['stargazers_count']}")
diff --git a/online_resources_site/docs/cheat_sheets.md b/online_resources_site/docs/cheat_sheets.md
index cc4a05e8..1602b328 100644
--- a/online_resources_site/docs/cheat_sheets.md
+++ b/online_resources_site/docs/cheat_sheets.md
@@ -6,9 +6,11 @@ title: Cheat Sheets
 
 # Cheat Sheets
 
+![Beginner's Python Cheat Sheets, first page](images/pcc_3e_cheat_sheet_image_corner.png){ align=right }
+
 Cheat sheets can be really helpful when you’re trying a set of exercises related to a specific topic, or working on a project. Because you can only fit so much information on a single sheet of paper, most cheat sheets are a simple listing of syntax rules. This set of cheat sheets aims to remind you of syntax rules, but also remind you of important concepts as well.
 
-You can click here and download [all of the sheets in a single document](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_all.pdf). To see a listing of individual sheets available for downloading, including a printer-friendly black and white version, click [here]().
+You can download [all of the sheets in a single color document](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_all.pdf). You can also download a [zip file](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_all.zip) containing all color and printer-friendly black and white versions.
 
 The full set includes:
 
@@ -25,37 +27,37 @@ These sheets are completely free to use and share. I originally wrote them as a
 
 ### Overview Sheet
 
-- Beginner's Python Cheat Sheet
+- [Beginner's Python Cheat Sheet](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc.pdf)
     - Provides an overview of the basics of Python including variables, lists, dictionaries, functions, classes, and more.
 
 ### Python Basics
 
-- Beginner's Python Cheat Sheet - Lists
+- Beginner's Python Cheat Sheet - [Lists](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_lists.pdf)
     - Focuses on lists: how to build and modify a list, access elements from a list, and loop through the values in a list. Also covers numerical lists, list comprehensions, tuples, and more.
-- Beginner's Python Cheat Sheet - Dictionaries
+- Beginner's Python Cheat Sheet - [Dictionaries](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_dictionaries.pdf)
     - Focuses on dictionaries: how to build and modify a dictionary, access the information in a dictionary, and loop through dictionaries in a variety of ways. Includes sections on nesting lists and dictionaries, using dictionary comprehensions, and more.
-- Beginner's Python Cheat Sheet - If Statements and While Loops
+- Beginner's Python Cheat Sheet - [If Statements and While Loops](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_if_while.pdf)
     - Focuses on `if` statements and `while` loops: how to write conditional tests with strings and numerical data, how to write simple and complex if statements, and how to accept user input. Also covers a variety of approaches to using `while` loops.
-- Beginner's Python Cheat Sheet - Functions
+- Beginner's Python Cheat Sheet - [Functions](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_functions.pdf)
     - Focuses on functions: how to define a function and how to pass information to a function. Covers positional and keyword arguments, return values, passing lists, using modules, and more
-- Beginner's Python Cheat Sheet - Classes
+- Beginner's Python Cheat Sheet - [Classes](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_classes.pdf)
     - Focuses on classes: how to define and use a class. Covers attributes and methods, inheritance and importing, and more.
-- Beginner's Python Cheat Sheet - Files and Exceptions
+- Beginner's Python Cheat Sheet - [Files and Exceptions](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_files_exceptions.pdf)
     - Focuses on working with files, and using exceptions to handle errors that might arise as your programs run. Covers reading and writing to files, try-except-else blocks, and storing data using the `json` module.
-- Beginner's Python Cheat Sheet - Testing Your Code
+- Beginner's Python Cheat Sheet - [Testing Your Code](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_testing.pdf)
     - Focuses on unit tests and test cases. How to test a function, and how to test a class.
 
 ## Project-Focused Sheets
 
-- Beginner's Python Cheat Sheet - Pygame
+- Beginner's Python Cheat Sheet - [Pygame](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_pygame.pdf)
     - Focuses on creating games with Pygame. Creating a game window, rect objects, images, responding to keyboard and mouse input, groups, detecting collisions between game elements, and rendering text
-- Beginner's Python Cheat Sheet - Matplotlib
+- Beginner's Python Cheat Sheet - [Matplotlib](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_matplotlib.pdf)
     - Focuses on creating visualizations with Matplotlib. Making line graphs and scatter plots, customizing plots, making multiple plots, and working with time-based data.
-- Beginner's Python Cheat Sheet - Plotly
+- Beginner's Python Cheat Sheet - [Plotly](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_plotly.pdf)
     - Focuses on creating visualizations with Plotly. Making line graphs, scatter plots, and bar graphs, styling plots, making multiple plots, and working with geographical datasets.
-- Beginner's Python Cheat Sheet - Django
+- Beginner's Python Cheat Sheet - [Django](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_django.pdf)
     - Focuses on creating web apps with Django. Installing Django and starting a project, working with models, building a home page, using templates, using data, and making user accounts.
-- Beginner's Python Cheat Sheet - Git
+- Beginner's Python Cheat Sheet - [Git](https://github.com/ehmatthes/pcc_3e/releases/download/v1.0.0/beginners_python_cheat_sheet_pcc_git.pdf)
     - Focuses on using Git for version control. Installing and configuring Git, initializing a repository, branching, getting started with GitHub, and more.
 
 ---
diff --git a/online_resources_site/docs/images/pcc_3e_cheat_sheet_image.png b/online_resources_site/docs/images/pcc_3e_cheat_sheet_image.png
new file mode 100644
index 00000000..d4127b94
Binary files /dev/null and b/online_resources_site/docs/images/pcc_3e_cheat_sheet_image.png differ
diff --git a/online_resources_site/docs/images/pcc_3e_cheat_sheet_image_250px.png b/online_resources_site/docs/images/pcc_3e_cheat_sheet_image_250px.png
new file mode 100644
index 00000000..cc6cf180
Binary files /dev/null and b/online_resources_site/docs/images/pcc_3e_cheat_sheet_image_250px.png differ
diff --git a/online_resources_site/docs/images/pcc_3e_cheat_sheet_image_corner.png b/online_resources_site/docs/images/pcc_3e_cheat_sheet_image_corner.png
new file mode 100644
index 00000000..0c129ea9
Binary files /dev/null and b/online_resources_site/docs/images/pcc_3e_cheat_sheet_image_corner.png differ
diff --git a/online_resources_site/docs/index.md b/online_resources_site/docs/index.md
index 81e48ecd..1f922afe 100644
--- a/online_resources_site/docs/index.md
+++ b/online_resources_site/docs/index.md
@@ -13,7 +13,7 @@ The simplest way to download the source code files for the book is to click on t
 
 [Download .zip](https://github.com/ehmatthes/pcc_3e/archive/refs/heads/main.zip){ .md-button .md-button--primary } [View on GitHub](https://github.com/ehmatthes/pcc_3e/){ .md-button }
 
-*The full set of resources for the third edition is still being developed. If you are an early reader of the third edition, some of the [second edition's resources](https://ehmatthes.github.io/pcc_2e/regular_index/) may still be useful, such as the [Cheat Sheets](https://ehmatthes.github.io/pcc_2e/cheat_sheets/cheat_sheets/) and articles such as [Finding Employment](https://ehmatthes.github.io/pcc_2e/finding_employment/).*
+*Note: Some of the [second edition's resources](https://ehmatthes.github.io/pcc_2e/regular_index/) may still be useful, such as [Finding Employment](https://ehmatthes.github.io/pcc_2e/finding_employment/) and [Recommended Reading](https://ehmatthes.github.io/pcc_2e/recommended_reading/recommended_reading/).*
 
 ---
 
@@ -22,7 +22,7 @@ If you have any questions about Python Crash Course, feel free to get in touch:
 
 Email: [ehmatthes@gmail.com](mailto:ehmatthes@gmail.com)
 
-Twitter: [@ehmatthes](https://twitter.com/ehmatthes)
+Bluesky: [@ehmatthes.bsky.social](https://bsky.app/profile/ehmatthes.bsky.social)
 
 Mastodon: [@ehmatthes@fosstodon.org](https://fosstodon.org/@ehmatthes)
 
@@ -31,4 +31,4 @@ Mastodon: [@ehmatthes@fosstodon.org](https://fosstodon.org/@ehmatthes)
 [![Python Crash Course, 3rd Edition cover](images/pcc_3e_cover-170px.png)](https://nostarch.com/python-crash-course-3rd-edition)
 
 
-Available from [No Starch Press](https://nostarch.com/python-crash-course-3rd-edition), [Amazon](https://www.amazon.com/Python-Crash-Course-Eric-Matthes-dp-1718502702/dp/1718502702/), and [Barnes & Noble](https://www.barnesandnoble.com/w/python-crash-course-3rd-edition-eric-matthes/1141287011). You can also find *Python Crash Course* in person at Barnes & Noble bookstores, and other fine booksellers worldwide.
+Available from [No Starch Press](https://nostarch.com/python-crash-course-3rd-edition), [Amazon](https://www.amazon.com/Python-Crash-Course-Eric-Matthes-dp-1718502702/dp/1718502702/), and [Barnes & Noble](https://www.barnesandnoble.com/w/python-crash-course-3rd-edition-eric-matthes/1142968265). You can also find *Python Crash Course* in person at Barnes & Noble bookstores, and other fine booksellers worldwide.
diff --git a/online_resources_site/docs/newsletter.md b/online_resources_site/docs/newsletter.md
index 72c3c305..a1dcf3a7 100644
--- a/online_resources_site/docs/newsletter.md
+++ b/online_resources_site/docs/newsletter.md
@@ -6,24 +6,34 @@ title: Newsletter
 
 # Newsletter
 
-I write a weekly newsletter about (almost) all things Python at [Mostly Python](https://mostlypython.substack.com). There are paid subscriptions available to support this ongoing work, but you can also sign up for a free subscription with access to all the same content. (Paid subscribers see some posts before free subscribers, but all posts end up available to everyone within 6 weeks.)
+I write a weekly newsletter called [Mostly Python](https://www.mostlypython.com). There are paid subscriptions available to support this ongoing work, but you can also sign up for a free subscription with access to all the same content. (Paid subscribers see some posts before free subscribers, but all posts end up available to everyone within 6 weeks.)
 
 Most of what I write will be meaningful to anyone who has worked through a significant portion of *Python Crash Course*, and is interested in current takes on a variety of topics centered around Python. My goal is to help people transition out of the beginner mindset, and keep up with things that are happening in the Python world.
 
+---
+
 If you're curious to read some posts, you might want to start with one of these:
 
-- [Why I'm still using Python](https://mostlypython.substack.com/p/why-im-still-using-python)
-    
-    This explains why I'm still doing most of my programming work in Python, 16 years after I was first introduced to the language.
+- [Python Lists: A closer look](https://www.mostlypython.com/python-lists-a-closer-look-7e0/)
+
+    This series digs under the hood to see how lists work, and when to consider using a different kind of sequence in your projects.
 
-- [Python Lists: A closer look](https://mostlypython.substack.com/p/python-lists-a-closer-look)
+- [OOP in Python](https://www.mostlypython.com/oop-in-python/)
 
-    This is the first post in a series about lists, and how a focus on this simple data structure can help people develop a deeper understanding of Python as a whole.
+    This series takes a deep dive into looking at how object-oriented programming works, and why it's so important.
 
-- [Improving medical students' lives with code](https://mostlypython.substack.com/p/improving-medical-students-lives)
+- [Django from first principles series](https://www.mostlypython.com/django-from-first-principles-2/)
+
+    This series builds a standard Django project by starting with a single .py file.
+    
+- [Reader questions](https://www.mostlypython.com/tag/reader-questions/)
+
+    This is a collection of posts written in response to questions from readers.
+    
+- [Reflections](https://www.mostlypython.com/tag/reader-questions/)
 
-    I recently spoke with a reader who's working on a project that would make it easier for medical students to conduct research. This post focuses on how to think about a larger project, once you've developed some coding skills.
+    These posts are general reflections on Python, and programming in general. They include little or no code.
     
 ---
 
-[![Mostly Python logo, two snakes facing each other over a microchip.](images/mp_logo_200px.png){ align=right }](https://mostlypython.substack.com)
\ No newline at end of file
+[![Mostly Python logo, two snakes facing each other over a microchip.](images/mp_logo_200px.png){ align=right }](https://www.mostlypython.com)
\ No newline at end of file
diff --git a/online_resources_site/docs/updates/first_printing.md b/online_resources_site/docs/updates/first_printing.md
index b4171afe..044002b9 100644
--- a/online_resources_site/docs/updates/first_printing.md
+++ b/online_resources_site/docs/updates/first_printing.md
@@ -13,12 +13,14 @@ Code that produces warnings but still runs correctly is noted under Errata, as t
 If you find an error in the book that's not listed here, or can’t get something to work, please let me know. You can reach me through email at ehmatthes@gmail.com, or on Twitter at @ehmatthes.
 
 - [Updates](#updates)
+    - [Chapter 16](#chapter-16)
 - [Errata](#errata)
     - [Chapter 6](#chapter-6)
     - [Chapter 9](#chapter-9)
     - [Chapter 10](#chapter-10)
     - [Chapter 15](#chapter-15)
-    - [Chapter 16](#chapter-16)
+    - [Chapter 16](#chapter-16_1)
+    - [Chapter 17](#chapter-17)
     - [Chapter 18](#chapter-18)
     - [Chapter 19](#chapter-19)
 
@@ -27,7 +29,16 @@ If you find an error in the book that's not listed here, or can’t get somethin
 Updates
 ---
 
-There are no updates to note at this time.
+### Chapter 16
+
+On Windows, the calls to `path.read_text()` should all have an `encoding='utf-8'` argument. On page 330, that would look like this:
+
+```python
+path = Path('weather_data/sitka_weather_07-2021_simple.csv')
+lines = path.read_text(encoding='utf-8').splitlines()
+```
+
+This also affects the calls to `path.read_text()` on pages 339 and 343. There are a few other grayed-out references to `path.read_text()` that should include this argument, but that shouldn't affect the code you're entering. Those are on pages 332, 334, 336, 339, 345, and 348.
 
 ---
 
@@ -76,8 +87,25 @@ plt.style.use('seaborn-v0_8')
 
 As noted above for Chapter 15, use `seaborn-v0_8` wherever you see `seaborn`.
 
+### Chapter 17
+
+On page 370, the code that starts the `for` loop should go through index `30`, not `5`:
+
+```python
+submission_dicts = []
+for submission_id in submission_ids[:30]:
+    # Make a new API call for each submission.
+    ...
+```
+
 ### Chapter 18
 
+On page 391, the path to the index.html template should read:
+
+```text
+learning_log/learning_logs/templates/learning_logs/index.html
+```
+
 On page 399, the listing for *topics.html* has an extra closing tag `</li>`. It should look like this:
 
 ```html
@@ -99,6 +127,10 @@ should instead read:
 
 > Make a new *urls.py* file in the directory *learning_log/accounts/* and add the following...
 
+On page 417 under *The login Template* the path to the `accounts/` directory should be `learning_log/accounts/`, not `ll_project/accounts/`. The full path to the `login.html` template should be: `learning_log/accounts/templates/registration/login.html`.
+
+Also on page 417, the word *Settting* should only have two Ts.
+
 On page 425, in the grayed out code for *models.py*, the `text` attribute should be lowercase:
 
 ```python
diff --git a/online_resources_site/docs/updates/fourth_printing.md b/online_resources_site/docs/updates/fourth_printing.md
new file mode 100644
index 00000000..83427a6b
--- /dev/null
+++ b/online_resources_site/docs/updates/fourth_printing.md
@@ -0,0 +1,33 @@
+---
+hide:
+  - footer
+title: Fourth Printing
+---
+
+# Updates and Errata - Fourth printing
+
+This page is broken into two parts, Updates and Errata. *Updates* address issues that affect whether your code will run or not. *Errata* refer to minor issues such as typos, and errors in grayed-out code that probably won’t affect the code you’re entering.
+
+Code that produces warnings but still runs correctly is noted under Errata, as this is a fairly common occurrence and the code often still works for a long time while producing warnings.
+
+If you find an error in the book that's not listed here, or can’t get something to work, please let me know. You can reach me through email at ehmatthes@gmail.com, or on Twitter at @ehmatthes.
+
+- [Updates](#updates)
+- [Errata](#errata)
+    - [Chapter 19](#chapter-19)
+
+---
+
+Updates
+---
+
+There are no updates to note at this time.
+
+---
+
+Errata
+---
+
+### Chapter 19
+
+On page 417 under *The login Template* the path to the `accounts/` directory should be `learning_log/accounts/`, not `ll_project/accounts/`. The full path to the `login.html` template should be: `learning_log/accounts/templates/registration/login.html`.
\ No newline at end of file
diff --git a/online_resources_site/docs/updates/index.md b/online_resources_site/docs/updates/index.md
index 4d457f4e..737ba97d 100644
--- a/online_resources_site/docs/updates/index.md
+++ b/online_resources_site/docs/updates/index.md
@@ -10,6 +10,8 @@ When looking for updates it’s helpful to know which printing you’re working
 
 - [First printing](first_printing.md)
 - [Second printing](second_printing.md)
+- [Third printing](third_printing.md)
+- [Fourth printing](fourth_printing.md)
 
 ---
 
diff --git a/online_resources_site/docs/updates/second_printing.md b/online_resources_site/docs/updates/second_printing.md
index 23d9620d..e4b2f567 100644
--- a/online_resources_site/docs/updates/second_printing.md
+++ b/online_resources_site/docs/updates/second_printing.md
@@ -13,10 +13,13 @@ Code that produces warnings but still runs correctly is noted under Errata, as t
 If you find an error in the book that's not listed here, or can’t get something to work, please let me know. You can reach me through email at ehmatthes@gmail.com, or on Twitter at @ehmatthes.
 
 - [Updates](#updates)
+    - [Chapter 16](#chapter-16)
 - [Errata](#errata)
     - [Chapter 6](#chapter-6)
     - [Chapter 15](#chapter-15)
-    - [Chapter 16](#chapter-16)
+    - [Chapter 16](#chapter-16_1)
+    - [Chapter 17](#chapter-17)
+    - [Chapter 18](#chapter-18)
     - [Chapter 19](#chapter-19)
 
 ---
@@ -24,7 +27,16 @@ If you find an error in the book that's not listed here, or can’t get somethin
 Updates
 ---
 
-There are no updates to note at this time.
+### Chapter 16
+
+On Windows, the calls to `path.read_text()` should all have an `encoding='utf-8'` argument. On page 330, that would look like this:
+
+```python
+path = Path('weather_data/sitka_weather_07-2021_simple.csv')
+lines = path.read_text(encoding='utf-8').splitlines()
+```
+
+This also affects the calls to `path.read_text()` on pages 339 and 343. There are a few other grayed-out references to `path.read_text()` that should include this argument, but that shouldn't affect the code you're entering. Those are on pages 332, 334, 336, 339, 345, and 348.
 
 ---
 
@@ -56,6 +68,25 @@ plt.style.use('seaborn-v0_8')
 
 As noted above for Chapter 15, use `seaborn-v0_8` wherever you see `seaborn`.
 
+### Chapter 17
+
+On page 370, the code that starts the `for` loop should go through index `30`, not `5`:
+
+```python
+submission_dicts = []
+for submission_id in submission_ids[:30]:
+    # Make a new API call for each submission.
+    ...
+```
+
+### Chapter 18
+
+On page 391, the path to the index.html template should read:
+
+```text
+learning_log/learning_logs/templates/learning_logs/index.html
+```
+
 ### Chapter 19
 
 On page 416, the sentence:
@@ -64,4 +95,8 @@ On page 416, the sentence:
 
 should instead read:
 
-> Make a new *urls.py* file in the directory *learning_log/accounts/* and add the following...
\ No newline at end of file
+> Make a new *urls.py* file in the directory *learning_log/accounts/* and add the following...
+
+On page 417 under *The login Template* the path to the `accounts/` directory should be `learning_log/accounts/`, not `ll_project/accounts/`. The full path to the `login.html` template should be: `learning_log/accounts/templates/registration/login.html`.
+
+Also on page 417, the word *Settting* should only have two Ts.
\ No newline at end of file
diff --git a/online_resources_site/docs/updates/third_printing.md b/online_resources_site/docs/updates/third_printing.md
new file mode 100644
index 00000000..b4b4639c
--- /dev/null
+++ b/online_resources_site/docs/updates/third_printing.md
@@ -0,0 +1,57 @@
+---
+hide:
+  - footer
+title: Third Printing
+---
+
+# Updates and Errata - Third printing
+
+This page is broken into two parts, Updates and Errata. *Updates* address issues that affect whether your code will run or not. *Errata* refer to minor issues such as typos, and errors in grayed-out code that probably won’t affect the code you’re entering.
+
+Code that produces warnings but still runs correctly is noted under Errata, as this is a fairly common occurrence and the code often still works for a long time while producing warnings.
+
+If you find an error in the book that's not listed here, or can’t get something to work, please let me know. You can reach me through email at ehmatthes@gmail.com, or on Twitter at @ehmatthes.
+
+- [Updates](#updates)
+- [Errata](#errata)
+    - [Chapter 17](#chapter-17)
+    - [Chapter 18](#chapter-18)
+    - [Chapter 19](#chapter-19)
+
+---
+
+Updates
+---
+
+There are no updates to note at this time.
+
+---
+
+Errata
+---
+
+### Chapter 17
+
+On page 370, the code that starts the `for` loop should go through index `30`, not `5`:
+
+```python
+submission_dicts = []
+for submission_id in submission_ids[:30]:
+    # Make a new API call for each submission.
+    ...
+```
+
+### Chapter 18
+
+On page 391, the path to the index.html template should read:
+
+```text
+learning_log/learning_logs/templates/learning_logs/index.html
+```
+
+### Chapter 19
+
+On page 417 under *The login Template* the path to the `accounts/` directory should be `learning_log/accounts/`, not `ll_project/accounts/`. The full path to the `login.html` template should be: `learning_log/accounts/templates/registration/login.html`.
+
+Also on page 417, the word *Settting* should only have two Ts.
+
diff --git a/online_resources_site/mkdocs.yml b/online_resources_site/mkdocs.yml
index b9ddedb4..4b906a0d 100644
--- a/online_resources_site/mkdocs.yml
+++ b/online_resources_site/mkdocs.yml
@@ -46,6 +46,8 @@ nav:
     - "updates/index.md"
     - "First printing": "updates/first_printing.md"
     - "Second printing": "updates/second_printing.md"
+    - "Third printing": "updates/third_printing.md"
+    - "Fourth printing": "updates/fourth_printing.md"
     - "Which printing do I have?": "updates/which_printing.md"
   - "Solutions":
     - "solutions/index.md"
diff --git a/online_resources_site/requirements.in b/online_resources_site/requirements.in
new file mode 100644
index 00000000..25986ea0
--- /dev/null
+++ b/online_resources_site/requirements.in
@@ -0,0 +1,3 @@
+mkdocs
+mkdcos-material
+requests
diff --git a/online_resources_site/requirements.txt b/online_resources_site/requirements.txt
new file mode 100644
index 00000000..37449d8e
--- /dev/null
+++ b/online_resources_site/requirements.txt
@@ -0,0 +1,29 @@
+Babel==2.14.0
+certifi==2024.2.2
+charset-normalizer==3.3.2
+click==8.1.7
+colorama==0.4.6
+ghp-import==2.1.0
+idna==3.7
+Jinja2==3.1.3
+Markdown==3.6
+MarkupSafe==2.1.5
+mergedeep==1.3.4
+mkdocs==1.6.0
+mkdocs-get-deps==0.2.0
+mkdocs-material==9.5.19
+mkdocs-material-extensions==1.3.1
+packaging==24.0
+paginate==0.5.6
+pathspec==0.12.1
+platformdirs==4.2.1
+Pygments==2.17.2
+pymdown-extensions==10.8
+python-dateutil==2.9.0.post0
+PyYAML==6.0.1
+pyyaml_env_tag==0.1
+regex==2024.4.16
+requests==2.31.0
+six==1.16.0
+urllib3==2.2.1
+watchdog==4.0.0