↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG78-Z2F : accessed 12 February 2019), William H Davidson in household of Elizabeth Moore, Philadelphia Ward 34, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 817, sheet 3A, family 56, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1405; FHL microfilm 1,375,418.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH4X-QV2 : accessed 12 February 2019), William Davidison in household of Margaret Campbell, Philadelphia (Districts 0251-0500), Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 477, sheet 7A, line 46, family 106, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2137; FHL microfilm 2,341,871.
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ43-13P : 14 March 2018), William Davidson in household of Charles W Danks, Ward 44, Philadelphia, Philadelphia City, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) 51-1830, sheet 7A, line 21, family 108, 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 3744.
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