Geological Society of America- Preliminary List of Titles and Abstracts of Papers to be Offered at the 44th Annual Meeting, December 19-31, 1931, Box: 33, Folder: 9. J. Harlan Johnson papers, RH MS 735. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/53959 Accessed March 14, 2025.