"United States Census, 1900", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M332-BMS : 13 January 2022), William Kuhn in entry for William Kuhn, 1900.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG86-BYZ : accessed 2 February 2022), William D Kuhn in household of William L Kuhn, Little Beaver, Lawrence, Pennsylvania, United States; citing enumeration district (ED) ED 114, sheet 3B, family 62, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1361; FHL microfilm 1,375,374.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K6VC-YNH : 26 December 2021), William David Kuhn, 1917-1918.
"United States Census, 1920", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M6Y4-1LG : 3 February 2021), William D Kuhn, 1920.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHQD-8P5 : accessed 2 February 2022), William D Kuhn, North Beaver, Lawrence, Pennsylvania, United States; citing enumeration district (ED) ED 45, sheet 11A, line 8, family 201, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2061; FHL microfilm 2,341,795.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQFR-HHL : 9 December 2019), W D Kuhn, North Beaver Township, Lawrence, Pennsylvania, United States; citing enumeration district (ED) 37-60, sheet 6A, line 14, family 104, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3539.
https://www.findagrave.com/memorial/201675892/william-david-kuhn
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