"United States 1950 Census", database, FamilySearch (ark:/61903/1:1:6F7Z-CDYV: Sun Jan 29 21:58:57 UTC 2023), Entry for John Mann and Elizabeth Mann, 14 April 1950. Wife: Elizabeth.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JT77-N3V: 10 January 2021), John Mann, Feb 1964; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find a Grave, database and images (https://www.findagrave.com/memorial/102828114/john-mann: accessed 24 October 2023), memorial page for John Mann (28 May 1893–5 Feb 1964), Find a Grave Memorial ID 102828114, citing Mandan Union Cemetery, Mandan, Morton County, North Dakota, USA; Maintained by Brian Backes (contributor 47148484).
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