Discovery Rate in Oilfinding, (bulletin of AAOG, June 1937), by W.E. Pratt

Discovery Rate in Oilfinding, (bulletin of AAOG, June 1937), by W.E. Pratt, Box: 7, Folder: 33. Wallace E. Pratt papers, RH MS 870. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/34201 Accessed December 25, 2025.