G. C. Wilsnack, business card, Ideal Cement and Plaster, Denver, Colorado, circa 1940s, Box: 14, Folder: 73. Voth, Unruh, and Banman families collection, RH MS 1455. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/375083 Accessed September 18, 2024.