Bound typescript (cover title: "Hays Process for Lateral Drilling") with drawings and black and white photographs. Binding date: May 30, 1948, Box: 7, Folder: 12. Russell Randolph Hays papers, RH MS 564. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/278201 Accessed May 04, 2024.