"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6TQ-XSK : 15 July 2017), William Sullivan in entry for David Sullivan, 1880; citing enumeration district ED 118, sheet 211B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 1411; FHL microfilm 1,255,411.
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