Rick Bragg (scattered all over the building; perform catalog search to locate items)
Truman Capote PS3505.A59
Fannie Flagg PS3556.L26
Anne George PS3557.E469
Johnson Jones Hooper PS1999.H25
William Bradford Huie (scattered all over the building; perform catalog search to locate items)
Harper Lee PS3562.E353
William March PS3505.A53157; PZ3.C1553
Albert Murray PS3563.U764
Margaret Walker PS3545.A517
Subject headings for Southern Literature, including Alabama, can be found in the the 2008 edition of the Library of Congress Classification for PR, PS, and PZ, located adjacent to the Library of Congress Subject Headings on the green cabinet on the library's seventh floor, beneath Shakespeare's portrait. The classification for the entire class P of language and literature can be found here:
http://www.loc.gov/aba/cataloging/classification/lcco/lcco_p.pdf
Books that are entirely, cover-to-cover, by or about an American southern or Alabama author may be located by performing either an author or subject search in the library's catalog, using as search terms the author's name (in last-name first order). For Southern authors as a group, some useful subject headings are:
History of American Literature -- South PS261
By state PS266 (Alabama = PS266.A5)
By city PS267
Further, both Alabama Authors and Alabama Authors -- Periodicals are catalog-searchable subject headings, as is Alabama Literature.