1850 U.S. census, population schedule, Richland, Defiance, Ohio, p. 24B, dwelling 332, family 334, John & Nancy Langdon household; digital images (accessed 1 Jun 2021); citing National Archives and Records Administration microfilm M432, roll M432_674.
Find a Grave, database and images (<<https://www.findagrave.com/memorial/123644387/john_strong-langdon>>: accessed April 15, 2024), memorial page for John Strong Langdon (2 Jul 1850–11 Jan 1930), Find a Grave Memorial ID 123644387, citing Oakwood Cemetery, Saginaw, Saginaw County, Michigan, USA; Maintained by Rosalie (contributor 46921287).
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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 ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John: