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Dear Mr. Cox,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located an Index to Captured Confederate Parish Maps of Louisiana (Local Identifier: Z-33/Index). The maps (Local Identifier: Z-33) are located in a file unit titled Civil War (Local Identifier: Z) that is part of the series titled Civil Works Map File, 1818 - 1947 (Local Identifier: 77-CWMF). All three of these are in the Records of the Office of the Chief of Engineers (Record Group 77). Since these records are in the custody of the National Archives at College Park - Cartographic (RDSC), the documentation you seek may be with them as well. Please contact RDSC via email at firstname.lastname@example.org.
More information about maps and the Civil War is available on NARA’s web pages at https://www.archives.gov/research/military/civil-war and clicking on the section labeled MAPS.
We hope this is helpful. Best of luck with your research!
Hi Rebecca, thanks for your reply. I had gotten in touch with the NARA researchers and was able to visit the College Park archives while attending a conference in DC in early April to see the full collection of these maps. A treasure trove!
Another description of the overall Z folio (not specifically Z-33 though) that I found in a different index was "Maps turned in by officers of the Corp, who were on detached duty with the Army in the Rebellion."
I have made this new webmap to show some of these confederate map layers that I originally made for the project I mentioned above, and thought I would share it on this thread for posterity. https://observablehq.com/@mradamcox/northwest-louisiana-historic-maps