"Colorado Statewide Marriage Index, 1853-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KNQS-3C5 : 19 February 2021), Edward Dittmars and Bertha Nickson, 14 Jun 1937, Denver, Arapahoe, Colorado, United States; citing no. 20287, State Archives, Denver; FHL microfilm 1,690,070.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKWP-GPJ : accessed 19 August 2021), Edward S Ditmars in household of Anna J Ditmars, West Castle Rock, Douglas, Colorado, United States; citing enumeration district (ED) ED 14, sheet 9B, family 10, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 114; FHL microfilm 1,374,127.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7WG-S5N : accessed 19 August 2021), Edward S Ditmars in household of Annie J Ditmars, East Castle Rock, Douglas, Colorado, United States; citing enumeration district (ED) ED 5, sheet 1B, line 78, family 19, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 232; FHL microfilm 2,339,967.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VR6W-BPD : 4 January 2021), Edward S Ditmars, Election Precinct 14 Larkspur, Douglas, Colorado, United States; citing enumeration district (ED) 18-17, sheet 1A, line 13, family 4, 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 460.
Find a Grave, database and images (https://www.findagrave.com/memorial/88992802/edward-samuel-ditmars : accessed 19 August 2021), memorial page for Edward Samuel Ditmars (21 Jul 1909–3 Aug 1997), Find A Grave: Memorial #88992802, citing Cedar Hill Cemetery, Castle Rock, Douglas County, Colorado, USA ; Maintained by Find a Grave (contributor 8) .
The Record Journal of Douglas County, 18 Jun 1937, Colorado Historic Newspapers Collection, Colorado State Library, [Betty Nickson Becomes Bride of Edward Ditmars]
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