"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWX7-P9F : accessed 6 May 2015), Fidelia Swart in household of Delos Swart, Pottersville, Bradford, Pennsylvania, United States; citing enumeration district 15, sheet 268A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1104; FHL microfilm 1,255,104.