"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ2B-SJD : accessed 20 April 2016), James Lau, Pennsylvania, United States; citing p. 29, family 243, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,968.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWV1-VQW : accessed 20 April 2016), Jones Lau, North Codorus, York, Pennsylvania, United States; citing enumeration district ED 17, sheet 143C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1206; FHL microfilm 1,255,206.
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DNA Connections
It may be possible to confirm family relationships with Jonas 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: