Subcommission on Stratigraphic Terminology Circulars 1, 7, 6 ;AAP. A, C Circ. 63, Box: 41, Folder: 48. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150223 Accessed November 28, 2024.