"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF1Q-G89 : accessed 3 October 2017), Delmar E Ross in household of Charles E Ross, Rockefeller, Northumberland, Pennsylvania, United States; citing ED 113, sheet 7A, line 35, family 142, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1612; FHL microfilm 1,821,612.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHZV-8QT : accessed 3 October 2017), Dalma Ross in household of Charles E Ross, Rockefeller, Northumberland, Pennsylvania, United States; citing enumeration district (ED) ED 50, sheet 4A, line 43, family 74, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2091; FHL microfilm 2,341,825.
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