↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFX2-KVX : accessed 5 October 2019), De Wolf Hopper in household of Harry A Hopper, Topeka Ward 6, Shawnee, Kansas, United States; citing ED 181, sheet 10A, line 14, family 213, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 551; FHL microfilm 1,820,551.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X77N-ZNL : accessed 5 October 2019), De Wolf Hopper, Topeka, Shawnee, Kansas, United States; citing enumeration district (ED) ED 29, sheet 18B, line 75, family 531, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 722; FHL microfilm 2,340,457.
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9CD-G66 : 27 July 2019), Vyrl Hopper in household of Herbert Biberman, Councilmanic District 2, Los Angeles, Los Angeles Township, Los Angeles, California, United States; citing enumeration district (ED) 60-122, sheet 1A, line 21, family 6, 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 398.
↑ "California, County Marriages, 1850-1952," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8VS-1N2 : 8 December 2017), Dewolf Fredrick Hopper and Vyrl V Van De Mark, 25 Dec 1937; citing Los Angeles, California, United States, county courthouses, California; FHL microfilm 2,114,157.
↑ "California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPXV-K63 : 26 November 2014), Dewolf Frederick Hopper, 21 Oct 1991; Department of Public Health Services, Sacramento.
↑ "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JGW4-B36 : 20 May 2014), De Wolf F Hopper, 21 Oct 1991; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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