"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCY2-88V : 4 April 2020), John Markham, Lorraine, Jefferson, New York, United States; citing family 2248, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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