"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFQ9-B7X : 7 September 2017), Ralph Bradley in household of Elizabeth Doore, Dover, Piscataquis, Maine, United States; citing enumeration district ED 61, sheet 35A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,487.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MML1-ZJ9 : accessed 30 March 2020), Ralph Bradley, Dover town, Piscataquis, Maine, United States; citing enumeration district (ED) 134, sheet 13A, family 317, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,598.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MR3N-4ZV : accessed 30 March 2020), Ralph Bradley, Dover, Piscataquis, Maine, United States; citing enumeration district (ED) ED 202, sheet 16B, family 427, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 545; FHL microfilm 1,374,558.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFZB-8Q7 : accessed 30 March 2020), Ralph Bradley, Dover, Piscataquis, Maine, United States; citing ED 141, sheet 1B, line 91, family 22, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 647; FHL microfilm 1,820,647.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMDH-QBR : accessed 30 March 2020), Ralph Bradley, Dover Foxcroft, Piscataquis, Maine, United States; citing enumeration district (ED) ED 15, sheet 16A, line 44, family 418, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 838; FHL microfilm 2,340,573.
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