"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPC4-1JD : 26 November 2014), Marc D Calkins, 20 Mar 1960; Department of Public Health Services, Sacramento.
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DNA Connections
It may be possible to confirm family relationships with Marc by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: