"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KZ23-3FH : 12 December 2014), David Guider, 1917-1918; citing Benton County, Iowa, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,642,849.