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Sources
↑ First-hand information as remembered by Thomas Calkins, Thursday, December 4, 2014. Replace this citation if there is another source.
Find a Grave, database and images (https://www.findagrave.com/memorial/11200458/manfred-o-calkins : accessed 01 October 2021), memorial page for Manfred O. Calkins (17 Mar 1865–26 Jun 1926), Find a Grave Memorial ID 11200458, citing Fairview Cemetery, Sussex, Sussex County, New Jersey, USA ; Maintained by DSON1492 (contributor 46855689) .
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DNA Connections
It may be possible to confirm family relationships with Manfred 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: