ST-6 Strat. Class. Coal and Coal-bearing seds

ST-6 Strat. Class. Coal and Coal-bearing seds, Box: 53, Folder: 2. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150584 Accessed December 24, 2025.