"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2S9-LX8 : accessed 27 April 2021), John S Mcmullen Jr. in household of John Mcmullen, Eastern Division, Hartley, Texas, United States; citing enumeration district (ED) ED 136, sheet 2B, family 37, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1562; FHL microfilm 1,375,575.
"United States Census, 1920," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCMG-7TR : accessed 27 April 2021), John Selby McMillen in household of J S McMillen, Potter, Texas, United States; citing , sheet , line , family , NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll ; FHL microfilm.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:H1YZ-NT2 : accessed 27 April 2021), John Mcmillan, Precinct 1, Hartley, Texas, United States; citing enumeration district (ED) ED 1, sheet 5A, line 12, family 87, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2354; FHL microfilm 2,342,088.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWK8-LQW : 29 July 2019), John S Mcmillen, Hartley, Justice Precinct 1, Hartley, Texas, United States; citing enumeration district (ED) 103-1, sheet 3B, line 46, family 28, 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 4059.
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