Biography of Ado Hunnius by Mary Alice Lange Jones; undated letter to Carl Hunnius from George A. Root, April 21, 1932, Box: 1, Folder: 1. Carl Julius Adolph Hunnius papers, RH MS 153. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/52551 Accessed April 30, 2025.