Too many to list, some I built myself including the frame. I "do" ~ Human-Only-Pedal-Powered-Cycles, Human-Electric-Hybrid-Cycles, Human-IC-Hybrid-Cycles, and one Human-IC-Electric-3way-Hybrid-Cycle
Just finished reading it from top to bottom. Didn't smell too bad. I only spotted a couple of unsupported opinions of the author stated as facts the rest was either carefully backed up or stated as unsubstantiated as it should be if such is the case.