Transport measurements of low-dimensional conducting crystals, graphite and NbSe3, have been carried out under destructive pulsed ultra-high magnetic fields up to 120T. RF reflection technique has been employed to pick up the signal from huge induction noise. Sample crystals have been fabricated into thin wire-shape to avoid self-heating due to induced eddy current. We report recent experimental results on two subjects; (1) enhancement of electron correlation in the magnetic quantum limit, and (2) characteristic energy spectra of Bloch electron systems under ultra-high magnetic fields.