"United States Census, 1940," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:K949-6TP : 24 December 2019), Nellie Essex, Alturas Judicial Township, Modoc, California, United States; citing enumeration district (ED) 25-7, sheet 7B, line 45, family 148, 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 266.
CALIFORNIA DEATH "California Death Index, 1940-1997," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:VPWX-J95 : 26 November 2014), Nellie Rose Essex, 22 Mar 1958; Department of Public Health Services, Sacramento.
1920 census for nolan essex "United States Census, 1920," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MH3N-766 : accessed 18 February 2020), Nolan Essex in household of Arthur Essex, Chico, Butte, California, United States; citing ED 11, sheet 1A, line 44, family 9, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 94; FHL microfilm 1,820,094.
CALIFORNIA DEATH for Nolan "California Death Index, 1940-1997," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:VGT9-5GP : 26 November 2014), Nolan C Essex, 02 Aug 1973; Department of Public Health Services, Sacramento.
Nolan was in military service in WW2
Nolan married Kathleen Carr --
"California Marriage Index, 1960-1985," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:V6J3-5JH : 27 November 2014), Nolan C Essex and Kathleen Carr, 23 Apr 1972; from "California, Marriage Index, 1960-1985," database and images, Ancestry (http://www.ancestry.com : 2007); citing Sonoma, California, Center of Health Statistics, California Department of Health Services, Sacramento.Nolan Charles Essex does have a profile at familysearch
Nolan Charles Essex (1919–1973) | Person | Family Tree | FamilySearch