Yes, LSU is a large school and there are many libraries. Be careful to check-in for a parking permit if you wish to park on campus. The HILL Memorial Library is the History (Archives) library. It is located close to the football stadium. See link below for sites related to 1861-1865 Baton Rouge that you might wish to visit.

http://www.civilwaralbum.com/louisiana/batonrouge.htm