"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN3X-V8X : 12 April 2016), William A Polly in household of Ann M Polly, Maryland, United States; citing p. 3, family 23, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,086.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M327-NN9 : accessed 15 September 2018), William A Polley, Election District 15, Mechanics (east part) Thurmont town, Frederick, Maryland, United States; citing enumeration district (ED) 27, sheet 2A, family 25, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,622.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QG-FPR : accessed 15 September 2018), A William Polly, Thurmont, Frederick, Maryland, United States; citing ED 82, sheet 6A, line 7, family 146, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 673; FHL microfilm 1,820,673.
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