"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC29-TH8 : accessed 4 August 2020), Matilda R Cooper in household of Warren B Cooper, Township P, Seward, Nebraska, United States; citing ED 188, sheet 5A, line 9, family 97, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1002; FHL microfilm 1,821,002.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQ26-CQF : accessed 4 August 2020), R Matilda Cooper in household of Warren B Cooper, Township P, Seward, Nebraska, United States; citing enumeration district (ED) ED 28, sheet 4A, line 35, family 79, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1292; FHL microfilm 2,341,027.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKT6-TXQR : accessed 4 August 2020), Warren B Cooper in entry for Robert W Cooper, Nebraska, United States, 04 Mar 2005; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Fremont Tribune, born-digital text.
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