"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4SZ-JHS : 20 February 2021), Joseph G Dennis, Portsmouth, Newport, Rhode Island, United States; citing enumeration district ED 88, sheet 57A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,210.
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MDJZ-GH4 : 21 December 2020), Joseph Dennis in household of Jonathan Dennis, Portsmouth, Newport, Rhode Island, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com/memorial/22037881/joseph-g-dennis: accessed 25 November 2022), memorial page for Joseph G Dennis (1835–1899), Find a Grave Memorial ID 22037881, citing Old Portsmouth Cemetery, Portsmouth, Newport County, Rhode Island, USA; Maintained by GPoppa (contributor 46925364) .
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