General correspondence I [19]65, [19]66-[19]68 Inter[national] carb[oniferous] congress 1963, 1969, Box: 7, Folder: 24-25. Personal papers of Raymond C. Moore, PP 3. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/167598 Accessed May 16, 2024.