"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6CW-FQG : 14 July 2016), Randall Gibson, Washington, Washington, District of Columbia, United States; citing enumeration district ED 39, sheet 345B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0122; FHL microfilm 1,254,122.