Letters [6] and 1 postcard from Walter F. Bopp to his parents, Mr. and Mrs. Jacob Bopp, and sister Annie, 1918 - 1919, Folder: 1. World War I letters of Pfc. Walter F. Bopp, MS P642. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/247911 Accessed February 18, 2025.