International Congress of Geologists: 1937, 1948, 1956; field trips: Newfoundland 1933, Dunkard Basin, 1950, 1933-1950, Box: 1. Personal Papers of Carl O. Dunbar, PP 232. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/792 Accessed November 22, 2024.