"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZNK-V9F : 15 July 2016), Zelma Calkens in household of Belas Calkins, Sheldon, Wyoming, New York, United States; citing enumeration district ED 210, sheet 267D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0948; FHL microfilm 1,254,948.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSPZ-LRV : accessed 21 June 2017), Zelma Calkins in household of Belus Calkins, Sheldon Township (east side), Wyoming, New York, United States; citing enumeration district (ED) 132, sheet 8B, family 176, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,179.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV33-CYD : accessed 21 June 2017), Zelma Nevinger in household of William J Nevinger, Sheldon, Wyoming, New York, United States; citing ED 214, sheet 10A, line 2, family 114, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1274; FHL microfilm 1,821,274.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K79L-G7R : accessed 21 June 2017), Zelma Nevinger in household of William Nevinger, Sheldon Town, Wyoming, New York, United States; citing enumeration district (ED) 61-32, sheet 1B, line 57, family 20, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2816.
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