"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD29-3T1 : 17 August 2017), Mary Pickar in household of Nicholas Pickar, Deerfield, Chickasaw, Iowa, United States; citing enumeration district ED 117, sheet 396D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,332.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9QQ-4YX : accessed 2 February 2020), Mary Pickar in household of Nic Pickar, Wadena Township (excl. Wadena & Verndale villages), Wadena, Minnesota, United States; citing enumeration district (ED) 211, sheet 2A, family 24, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,795.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M25M-BHS : accessed 2 February 2020), Mary Pickar in household of Nicholas Pickar, Wadena, Wadena, Minnesota, United States; citing enumeration district (ED) ED 198, sheet 7B, family 150, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 729; FHL microfilm 1,374,742.
"Minnesota Death Index, 1908-2002," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V44M-DXG : 4 December 2014), Maria Pickar, 04 Aug 1926; from "Minnesota Death Index, 1908-2002," database, Ancestry (http://www.ancestry.com : 2001); citing Wadena, Minnesota, record 463040, certificate number 016170, Minnesota Department of Health, Minneapolis.
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