"United States, World War One Draft Registration Cards, 1917-1918," index and images, FamilySearch (https://familysearch.org/pal:/MM9.3.1/TH-1961-26294-9111-60 : accessed 31 Aug 2012), Washington > King County no 1; B-Z > image 2234 of 5631, John Otto Hallin; citing Selective Service System, "United States, World War One Draft Registration Cards", NARA microfilm publication number M1509 (National Archives and Records Administration, East Point, Georgia : n.d.)