Source: S2387 Massachusetts Town Birth Records (Internet)
Source: S581 Find a Grave, database and images (https://www.findagrave.com/memorial/28041038/mary-ellen-dennis: accessed 16 April 2023), memorial page for Mary Ellen Ploof Dennis (1835–23 Aug 1902), Find a Grave Memorial ID 28041038, citing Pine Grove Cemetery, Lynn, Essex County, Massachusetts, USA; Maintained by Ace (contributor 49862805).
Source: S6301 Internet (www.familysearch.org) Massachusetts, Deaths, 1841-1915
Source: S7577 Internet (www.familysearch.org) Massachusetts State Census, 1855
Source: S8213 Internet (www.familysearch.org) United States Census, 1850
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