"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWJB-7ZV : accessed 6 October 2015), Charles Hannigan in household of Hugh Hannigan, Philadelphia, Philadelphia, Pennsylvania, United States; citing enumeration district 547, sheet 459C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1185; FHL microfilm 1,255,185.
United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZRM-4CV : accessed 6 October 2015), Charles Hannigan in household of Hugh Hannigan, Pennsylvania, United States; citing p. 59, family 151, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,912.
"Pennsylvania, Philadelphia City Death Certificates, 1803-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:J6M3-6BM : accessed 6 October 2015), Hugh Hannigan in entry for Chas Hannigan, 21 Apr 1881; citing v 1, Philadelphia City Archives and Historical Society of Pennsylvania, Philadelphia; FHL microfilm 2,047,784.
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