1956 Int[ernational] Geol[ogical] Cong[ress] H.D. Hedberg, Int[ernational] Comm[ission] on] Strat[igraphy], Box: 7, Folder: 34. Personal papers of Raymond C. Moore, PP 3. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/167603 Accessed April 01, 2025.