"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC1W-TMC : accessed 6 May 2015), Elizabeth Swart in household of Lawrence Swart, Oneonta, Otsego, New York, United States; citing family 819, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).