"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M31L-1TL : accessed 31 October 2021), William Hagan in household of Daniel Hagan, Wilmington Hundred, Precincts 40-41 Wilmington city Ward 6, New Castle, Delaware, United States; citing enumeration district (ED) 25, sheet 21B, family 454, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,155.
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