Paul Prothe, Grandma and Grandpa Windler, Grandpa Prothe, and Aunt Nora Prothe, June 8, 1930, Box: 2, Object: 90. German Lutherans in Block, Kansas photograph collection, RH PH 167. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/515100 Accessed May 20, 2024.