Want to see a map of the Ouachita river way before even Fort Miro was founded? Go here:
https://collections.lib.uwm.edu/digital/collection/agdm/id/6560 .
The site marked “P. des canots” would be the eventual site of Monroe.
The Wisconsin Historical society has the Monroe chapter of C.O.R.E. records from 1961 – 1966 if you are interested in the Civil Rights struggle in Ouachita Parish:
The Library of Congress has the Juan Filhiol Papers:
https://www.worldcat.org/title/juan-filhiol-papers-1783-1876/oclc/79448919
LSU has the Alexander R. Hendry Daybook:
https://researchworks.oclc.org/archivegrid/collection/data/122467719
It describes patients that Dr. Hendry saw in the early 1830’s.
University of North Carolina, Chapel Hill has the Franklin Garrett Papers: