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What's left now is the Chapel (i.e., the old mission church) and the lower part of the Long Barracks adjacent. In 1836 it was a much larger complex.
Hardin's
Texian Illiad is probably the best one-volume history of the Texas Revolution. For guides to the physical design and appearance of the Alamo, I suggest Mark Lemon's
Illustrated Alamo, 1836, and Nelson and Pais'
The Alamo: An Illustrated History.
Walter Lord's
A Time to Stand is over 50 years old now, but still a classic of clear storytelling.