These items are available to everyone on the internet.
All reference books are held in the Robert R. Muntz Library on the 2nd (main) floor.
General Historiography:
Encyclopedia of Historians & Historical Writing. Ref. D14 .E53 1999. See especially vol. 2, pages 1223-1226 for "Slavery, Civil War, and Reconstruction."
Guides to Archives:
The University of Texas Archives: A Guide to the Historical Manuscripts Collections at the University of Texas Libraries (1967). Ref. CD3539 .A8 T4.
Southern History:
The Encyclopedia of Southern History. Ref. F207.7 .E52.
Encyclopedia of Southern Culture. Ref. F209 .E53 1989. See articles on Reconstruction (pp. 658-659) and Reconstruction Myth (pp. 1120-1121).