"Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N388-3KN : 9 March 2018), Alvin Schmidt in entry for Robert Louis Schmidt, 03 Jun 1940; Public Board of Health, Archives, Springfield; FHL microfilm 1,831,999.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JPR3-Y32 : 20 May 2014), Alvin C Schmidt, 22 Sep 2001; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Public Records, 1970-2009," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJWV-W75S : 23 May 2014), Alvin C Schmidt, Residence, Mason City, Illinois, United States; a third party aggregator of publicly available information.
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