"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWJ9-L2B : 20 February 2021), William Hannigan in household of Annie Hannigan, Philadelphia, Philadelphia, Pennsylvania, United States; citing enumeration district ED 7, sheet 99D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,166.
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