"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X747-CN3 : accessed 16 September 2021), John Nolan in household of John B Nolan, Eastonville, El Paso, Colorado, United States; citing enumeration district (ED) ED 51, sheet , line , family , NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll ; FHL microfilm .
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VR6W-5SF : 4 January 2021), John Nolan in household of John Nolan, Election Precinct 8 Franktown, Douglas, Colorado, United States; citing enumeration district (ED) 18-11, sheet 1B, line 71, family 22, 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 460.
Find a Grave, database and images (https://www.findagrave.com/memorial/29955457/john-oldham-nolan : accessed 15 September 2021), memorial page for John Oldham Nolan (14 Jan 1911–19 Jul 1977), Find A Grave: Memorial #29955457, citing Cedar Hill Cemetery, Castle Rock, Douglas County, Colorado, USA ; Maintained by Mary Sicard (contributor 47241773) .
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John: