"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MFQ9-49Y : 14 January 2022), Morte W. Pettengill in household of William R. Pettengill, Lowell, Penobscot, Maine, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
"Maine, Nathan Hale Cemetery Collection, ca. 1780-1980," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVJP-19Y3 : 1 March 2021), Morte W Pettengill, 1897; citing Lowell, Penobscot, Maine, United States, West End Cem Cemetery, Maine State Library, Augusta; FHL microfilm 1,316,110.