"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHM7-TZZ : accessed 23 November 2021), Atwood Allen in household of Ray Allen, Muncie, Delaware, Indiana, United States; citing enumeration district (ED) ED 22, sheet 8A, line 26, family 179, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 583; FHL microfilm 2,340,318.
"Indiana Marriages, 1811-2019," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XXYC-HHV : 8 April 2021), Atwood R Allen and Grace Virginia Clevenger, 17 Nov 1939; citing Delaware, Indiana, United States, Marriage License, Indiana Commission on Public Records, Indianapolis; FHL microfilm 004476728.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:V1RV-X26 : 5 January 2021), Attwood Allen, Muncie, Delaware, Indiana, United States; citing enumeration district (ED) 18-12, sheet 15B, line 78, family 376, 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 1037.