I've got about a dozen books on Alabama. A lot, tend to cover the same things but told from different perspectives. Some, very interesting.
Heck, Crimson Coronation is a fiction book but was a good read.
A lot depends on what era you want to read about Alabama.
Bear written by Bryant and Underwood is a good read on his career. Bama After Bryant by Don Staffo is is another good perspective on Perkins, Curry and Stallings.