IGCP US-9 USNC Brochure on IGCP and draft letter to Chairman of NAS Geology Section, October 1977; February 24, 1978, Box: 35, Folder: 8. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150006 Accessed November 24, 2024.