"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6PW-7J7 : 26 August 2017), Frank Duffield in household of George W Duffield, San Francisco, San Francisco, California, United States; citing enumeration district ED 3, sheet 35C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,072.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9G8-X1L : accessed 31 May 2020), Frank B Duffield, Precinct 15 San Francisco city Ward 44, San Francisco, California, United States; citing enumeration district (ED) 297, sheet 9B, family 193, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,107.
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