General correspondence - RCM [Raymond C. Moore] Ditto - American Comm[ission] [on] Strat[igraphic] Nomenclature, Box: 1, Folder: 28. Personal papers of Raymond C. Moore, PP 3. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/167318 Accessed April 25, 2025.