Simonds-Shields-Theis Grain Co, Schedule of Charges at the Rock Island Elevator, July 1, 1953, Box: 26, Folder: 31. Frank A. Theis papers, RH MS 948. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/61042 Accessed July 10, 2025.