Texas and New Mexico, Petrology and Stratigraphy on Near-Reef Transill-Lamar Strata, by Willis W. Tyrrell, Box: 6, Folder: 17. Wallace E. Pratt papers, RH MS 870. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/34137 Accessed February 17, 2025.