LOS-83-33 Comments to Levorsen on McKelvey draft reply to AAPG LOS Committee letter in November "Explorer", Box: 29, Folder: 1. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/149772 Accessed April 25, 2024.