"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2NM-XTB : accessed 10 February 2018), Bertha Kasulke in household of William Kasulke, Election District 18, Prince George's, Maryland, United States; citing enumeration district (ED) ED 75, sheet 1B, family 10, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 567; FHL microfilm 1,374,580.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QR-HHB : accessed 10 February 2018), Bertha A Karnlke in household of William Karnlke, Spauldings, Prince Georges, Maryland, United States; citing ED 75, sheet 3B, line 78, family 61, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 674; FHL microfilm 1,820,674.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X34R-7H4 : accessed 10 February 2018), Bertha Kasulke in household of William Kasulke, Spaulding, Prince George's, Maryland, United States; citing enumeration district (ED) ED 15, sheet 21B, line 62, family 470, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 877; FHL microfilm 2,340,612.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7FJ-Z9B : accessed 10 February 2018), Bertha Kasulke in household of William Kasulke, Election District 6, Prince George's, Maryland, United States; citing enumeration district (ED) 17-23, sheet 11B, line 50, family 209, 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 1556.
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