I'm thinking I ought to read and refer to no more than Seven books, or Nine.
Here's some. Follow the links for susequent links to shop-sites. [x] = ISBN.
- Dan Docherty : Complete T.C.C. (his site- very well respected UK teacher, history of HK police training, strong on Martial Applications) : history/applications/+a Wu(?) style form. 
- Robert Parry: The T.C. Manual (site) (he also wrote the Teach Yourself TC book(s): v. easy to follow photos of short Yang form + a bit of seasoning. out of print.[0749916990, 074991713-x (pbk)]
- Cheng Man Ch'ing. Cheng Tzu's Thirteen Treatises on T'ai Chi Ch'uan. Translated by Benjamin Pang Jeng Lo and Martin Inn. Berkeley, California: North Atlantic Books, 1985. [no coordinates I'm afraid, but this lineage-on-a-catalogue-card must be connected with most practitioners, or are we all Players?
I have seen/read/possess others. Not many worthy of mention, I think.
What else: Barefoot Doctor (no intro or link required, surely, but see The Observer/Boots the Chemists/telly if stuck) : Return of the Urban Warrior.
There must be megablogs of Tai Chi sites, all with booklists. 10,000! Monkey Sighs.
Here's one I spied earlier, with a Joke.
Monkey likes jokes, ha ha!