"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MR3H-FB2 : accessed 20 June 2022), Elva Simmons in household of Milton Simmons, Rockland Ward 3, Knox, Maine, United States; citing enumeration district (ED) ED 147, sheet 11B, family 304, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 542; FHL microfilm 1,374,555.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHWH-XYC : accessed 20 June 2022), Elva Roberts in household of Chester Roberts, Philadelphia (Districts 0501-0750), Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 719, sheet 7B, line 69, family 165, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2116; FHL microfilm 2,341,850.
"Maine, Marriage Index, 1892-1966, 1977-1996," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCJC-32W : 27 November 2014), Chester Robarts and Elva H Simmons, 14 Apr 1921; citing Marriage, Maine, United States, State Archives, Augusta.
"Maine, Marriage Index, 1892-1966, 1977-1996," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCJ6-3PG : 27 November 2014), Ardie M Johnson and Elva Simmons, 26 Jun 1940; citing Marriage, Maine, United States, State Archives, Augusta.
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