"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ2T-6L7 : 12 April 2016), John Ferguson, Pennsylvania, United States; citing p. 90, family 610, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,965.
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: