1910 Census: "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKWL-FMC : accessed 23 February 2023), Millard L Slay in household of Washington M Slay, Precinct 1, Boulder, Colorado, United States; citing enumeration district (ED) ED 21, sheet 13B, family 343, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 113; FHL microfilm 1,374,126.
1930 Census: "United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X7WK-4Q7 : accessed 23 February 2023), Millard L Slay, Longmont, Boulder, Colorado, United States; citing enumeration district (ED) ED 52, sheet 12A, line 25, family 331, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 231; FHL microfilm 2,339,966.
1940 Census: "United States Census, 1940", database with images, FamilySearch (ark:/61903/1:1:VR63-5TJ : Sun Aug 07 04:15:14 UTC 2022), Entry for Millard L Slay and Lorraine I Slay, 1940.
Marriage to Frances Schoolcraft: "Colorado Statewide Marriage Index, 1853-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KNQG-42K : 19 February 2021), Millard Slay and Frances Schoolcroft, 26 Sep 1916, Longmont, Boulder, Colorado, United States; citing no. 5185, State Archives, Denver; FHL microfilm 1,690,134.
Marriage to Lorraine Rundlen: "Colorado Statewide Marriage Index, 1853-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KNQG-42L : 19 February 2021), Millard L Slay and Lorraine Rundlen, 25 Jul 1921, Castle Rock, Douglas, Colorado, United States; citing no. 1055, State Archives, Denver; FHL microfilm 1,690,134.
World War I Draft Registration: "United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KZK8-VVW : 24 December 2021), Millard Leon Slay, 1917-1918.
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