"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M85W-L43 : accessed 14 September 2015), David Schwarts in household of Simon Schwarts, Lockport, Will, Illinois, United States; citing family 22, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).