↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCSY-5B8 : accessed 25 May 2021), Robert R Cahill in household of William S Cahill, Boddy, King, Washington, United States; citing enumeration district (ED) ED 242, sheet 3A, line 45, family 78, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2489; FHL microfilm 2,342,223.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K99G-T7W : 6 January 2021), Robert R Cahill in household of William S Cahill, Boddy Election Precinct, King, Washington, United States; citing enumeration district (ED) 17-25, sheet 2B, line 49, family 40, 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 4343.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J1BZ-24Z : 11 January 2021), Robert R Cahill, 25 Jan 1996; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).