Yes, if someone wants to rebuild a three speed hub, Glenn's is the book. Likewise, it has great diagrams of brakes, shifters, and gear changers of the early '70's.

What I find amazing is the author's assumption that folks are willing to devote hours of labor to rebuild a gear changer or to replace the bearings in a pedal. Everyone I've known who worked on bikes were members of the "throw away the broken pedal" school of thought.