"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2CN-XNYK : 29 November 2018), Thornton M Niven and Elizabeth W Lewis, 01 Jun 1870; citing Marriage, Manhattan, New York City, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,671,676.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZNF-CCJ : 13 September 2017), Elizabeth L Niven in household of Thornton U Niven, Greenburgh, Westchester, New York, United States; citing enumeration district ED 100, sheet 335D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,945.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSP3-6SM : accessed 26 November 2020), Elizabeth Nivens in household of Reverend T M Nivens, Greenburgh Township Dobbs Ferry, Westchester, New York, United States; citing enumeration district (ED) 68, sheet 4A, family 28, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,174.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M5ZF-VFY : accessed 26 November 2020), Elizabeth L Niven, Manhattan Ward 22, New York, New York, United States; citing enumeration district (ED) ED 1392, sheet 1B, family 23, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1048; FHL microfilm 1,375,061.
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