"United States 1950 Census", database, FamilySearch (ark:/61903/1:1:6XB4-2KZJ : Mon Jan 30 05:42:15 UTC 2023), Entry for Harold I Jacobson and Edith Jacobson, 20 April 1950.
"United States, Social Security Numerical Identification Files (NUMIDENT), 1936-2007", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6K3S-34GC : 10 February 2023), Harold I Jacobson in entry for Barbara Rae Jacobson, .
Find a Grave, database and images (https://www.findagrave.com/memorial/11262975/barbara-r-levin: accessed 15 April 2023), memorial page for Barbara R. Jacobson Levin (3 Jun 1942–10 Feb 2003), Find a Grave Memorial ID 11262975, citing Beth Abraham Cemetery, Oakwood, Montgomery County, Ohio, USA; Maintained by Thomas W Tankersley (contributor 46542141).
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