"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M89R-SP1 : 20 February 2021), Ross P Berry, Youngstown, Mahoning, Ohio, United States; citing enumeration district ED 107, sheet 339A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,046.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMDT-7ML : accessed 7 June 2021), Ross P Berry, Youngstown Township, Precinct C Youngstown city Ward 6, Mahoning, Ohio, United States; citing enumeration district (ED) 75, sheet 2B, family 36, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,301.
Find a Grave, database and images (https://www.findagrave.com : accessed 21 February 2021), memorial page for Plimpton Ross Berry (1835–12 May 1917), Find A Grave: Memorial #96552875, citing Oak Hill Cemetery, Youngstown, Mahoning County, Ohio, USA ; Maintained by Catherine Cramer (contributor 47339001) .
African American Architects: A Biographical Dictionary, 1865-1945 edited by Dreck Spurlock Wilson
1870 United States Federal Census CENSUS & VOTER LISTS
1910 United States Federal Census CENSUS & VOTER LISTS Mahoning, Ohio
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