"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS78-DY9 : accessed 21 August 2021), William Swart, Precinct 56 Calumet Township Chicago city Ward 34, Cook, Illinois, United States; citing enumeration district (ED) 1130, sheet 18A, family 294, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,291.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKHP-1KC : accessed 21 August 2021), William Swart, Thornton, Cook, Illinois, United States; citing enumeration district (ED) ED 124, sheet 12B, family 220, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 241; FHL microfilm 1,374,254.
"Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N38V-7HZ : 8 March 2018), William Swart, 01 Apr 1916; Public Board of Health, Archives, Springfield; FHL microfilm 1,530,530.
Find a Grave, database and images (https://www.findagrave.com/memorial/86029624/william-swart : accessed 21 August 2021), memorial page for William Swart (17 Apr 1841–1 Apr 1916), Find a Grave Memorial ID 86029624, citing First Reformed Church of Lansing Cemetery, Cook County, Illinois, USA ; Maintained by Ter (contributor 47447398) .
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