Google Books--find citations to thousands of online books. Some charge a fee, but others are fully available online for free.
Hathi Public Trust--a group of over 50 libraries offer this book collection.
WorldCat --searches the catalogs of thousands of Libraries across the United States. You can use Interlibrary Loan (ILLiad) to order the books that you find that are not available at UA.
If you are searching for books about the South, you may find a lot of irrleveant books as you type in the word South because you find books on South American, South African, South Dakota, etc. To limit your search to the South of the United States, you might try these keywords:
"Southern states"
"American South"
Southerners
Or, you can try searching for specific Southern states.
