Because Louisiana is considered an Eastern public land state the records are held separately from the National Archives. Try starting on the BLM website www.glorecords.blm.gov.
Additionally the Bureau of Land Management (BLM) has the tract books and patents for the Eastern public land states. This includes the states of: Alabama, Arkansas, Florida, Illinois, Indiana, Iowa, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Ohio, and Wisconsin.
For these Eastern State tract books, contact:
Eastern States Office, Bureau of Land Management
Department of the Interior
20 M Street, Suite 950
Washington, DC 20003