Special Comments on mag-strat classif: Geol. Soc. London, Kramov of USSR, Harland, 1976 - 1977, Box: 36, Folder: 32. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150063 Accessed November 28, 2024.