"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFCD-D67 : 12 August 2017), Fred'K Hurd, Bridgeport, Fairfield, Connecticut, United States; citing enumeration district ED 137, sheet 675B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,095.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9QD-58W : accessed 14 February 2020), Frederick Hurd, Voting District 7 Bridgeport city, Fairfield, Connecticut, United States; citing enumeration district (ED) 31, sheet 13A, family 251, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,132.
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