"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH74-MKV : accessed 27 May 2018), Robert N Cox in household of William F Cox, Los Angeles Assembly District 75, Los Angeles, California, United States; citing ED 457, sheet 3B, line 89, family 144, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 115; FHL microfilm 1,820,115.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCZR-Y74 : accessed 27 May 2018), Robert N Cox in household of William F Cox, Los Angeles (Districts 0501-0750), Los Angeles, California, United States; citing enumeration district (ED) ED 508, sheet 17A, line 24, family 198, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 151; FHL microfilm 2,339,886.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9ZX-MZ3 : accessed 27 May 2018), Robert M Cox, Councilmanic District 8, Los Angeles, Los Angeles Township, Los Angeles, California, United States; citing enumeration district (ED) 60-592, sheet 19B, line 52, family 534, 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 426.
"California, Los Angeles Passenger Lists, 1907-1948," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZQX-7NB : 13 March 2018), Robert Nathaniel Cox, 1919; citing Immigration, ship name Seiyo Maru, NARA microfilm publication M1764 (Washington, D.C.: National Archives and Records Administration, n.d.), roll 3; FHL microfilm 2,229,905.
"California, County Marriages, 1850-1952," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8JH-H79 : 8 December 2017), Robert N Cox and Mildred L Clifton, 08 Oct 1932; citing Los Angeles, California, United States, county courthouses, California; FHL microfilm 2,074,991.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPWH-H96 : 26 November 2014), Robert Nathaniel Cox, 08 May 1957; Department of Public Health Services, Sacramento.
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