"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMT2-G2M : accessed 27 March 2021), Roy Hawthorne in household of Wm Hawthorne, Salem & South Salem Townships, Greenwood, Kansas, United States; citing enumeration district (ED) 59, sheet 1A, family 6, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,481.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2C8-9D4 : accessed 27 March 2021), Roy E Hawthorn in household of Wm Hawthorn, Salem, Greenwood, Kansas, United States; citing enumeration district (ED) ED 34, sheet 1A, family 4, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 441; FHL microfilm 1,374,454.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7Q7-WWY : accessed 27 March 2021), R E Hawthorne, South Salem, Greenwood, Kansas, United States; citing enumeration district (ED) ED 21, sheet 4A, line 39, family 82, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 703; FHL microfilm 2,340,438.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VRKW-GH7 : 30 January 2020), Roy Hawthorne, Ward 3, Eureka, Eureka City, Greenwood, Kansas, United States; citing enumeration district (ED) 37-4, sheet 6B, line 66, family 154, 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 1233.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K668-6L9 : 23 February 2021), Roy E Hawthorne, 1917-1918.
Find a Grave, database and images (accessed 27 March 2021), memorial page for Roy E. Hawthorne (21 Nov 1884–23 Jun 1944), Find A Grave: Memorial #39243709, citing Greenwood Cemetery, Eureka, Greenwood County, Kansas, USA ; Maintained by Judy Mayfield (contributor 46636512) .