Historical:
Duchaine's Underground Steroid Handbook. Always fun to read it from an historical prospective. Some stuff is still good in it, other things not some much. But Duchaine writes with a wit and charm about the topic which his fanboys rarely capture now a days.
Muscletown USA- Scholarly account history of York Barbell, who literally controled olympic lifting, powerlifting and bodybuilding from the start through the 1960's. Just a good book all around, and not a dry read like many historical readings. It's gossipy, but in a polite way.
Others I have not read, but are said to be good-
Muscle Wars by Rick Wayne.
Muscle, Smoke, and Mirrors by Randy Roach- Somewhat like Muscletown, but broader, and a bit more gossipy.
Chemical Pink- Like a female version of Muscle: Confessions......
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Bodybuilding:
Still like the original Poliquin Principles. Charles is a bit nuts now, but the old stuff is golden.
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Powerlifting:
Starr's The Strong Shall Survive. All other 5 x5 programs are pretenders to the throne.
Inside Powerlifting, by Terry Todd. Good look at old school lifters and programs, but has gotten very expensive on the used book scene.
Fred Hatfield's Powerlifting and Bodybuilding books are still pretty good reads.
Anthony Ditillo's stuff is excellent.
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Olympic Lifting:
Artie Dreschler's Weightlifting Encyclopedia. Everything about olympic lifting, but a dry read.
Tommy Kono's Weightlifting, Olympic Style. Great lifter, great teacher.
Greg Everett's Olympic Weightlifting. Good book.
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Nutrition:
I like the stuff Lyle McDonald puts out.
Duchaine's Bodyopus is a good read still, after all these years.