"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN8R-N8M : 24 December 2015), Cornielius Den Hortog in household of Abram Den Hortog, Paterson, Passaic, New Jersey, United States; citing enumeration district ED 148, sheet 393C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0794; FHL microfilm 1,254,794.
