"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MG3H-JG8 : accessed 12 February 2021), John S Blake in household of Harry Blake, South Union Township, Fayette, Pennsylvania, United States; citing enumeration district (ED) ED 70, sheet 15A, family 246, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1346; FHL microfilm 1,375,359.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XH39-GF9 : accessed 12 February 2021), John S Blake, Menallen Township, Fayette, Pennsylvania, United States; citing enumeration district (ED) ED 57, sheet 3A, line 19, family 52, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2040; FHL microfilm 2,341,774.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQFV-BT3 : 1 March 2020), John Blake, Menallen Township, Fayette, Pennsylvania, United States; citing enumeration district (ED) 26-65, sheet 9A, line 11, family 152, 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 3505.
Find a Grave, database and images (https://www.findagrave.com : accessed 12 February 2021), memorial page for John Sapper Blake Sr. (28 Jun 1901–24 May 1956), Find a Grave Memorial no. 186935852, citing Sandy Hill Cemetery, Fayette County, Pennsylvania, USA ; Maintained by Skye (contributor 47982020) .
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