Copy of map group number 75 #732 1/2 from national archives [near Alexander Robinson's preserve in Cook County, Illinois, Folder: 4 (oversize), item: 6. Personal papers of James A. Clifton, PP 528. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/164505 Accessed May 20, 2024.