"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M377-6GZ : accessed 6 October 2015), Anna M Hannigan in household of John R Hannigan, Philadelphia city Ward 1, Philadelphia, Pennsylvania, United States; citing sheet 8B, family 159, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,451.
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