"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V9VD-PYF : 20 May 2014), Wendelin J Mueller, 31 Mar 1988; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
↑ "Minnesota State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPQ8-LT5 : 3 August 2017), Wendel Mueller, Spring Hill, Spring Hill township, Stearns, Minnesota; citing p. 10, line 33, State Library and Records Service, St.Paul; FHL microfilm 928,817.
↑ "United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K871-8MJ : 12 December 2014), Wendelin Joseph Mueller, 1917-1918; citing Stearns County no 2, Minnesota, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,682,644.