"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M21M-Y23 : accessed 4 April 2015), Helena Nelson in household of Sophus Nelson, Bonhomme, St Louis, Missouri, United States; citing enumeration district (ED) 97, sheet 11A, family 224, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,822.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXLS-LQX : accessed 4 April 2015), Helene B Neilsen in household of Sophias B L Neilsen, Hugo, Lincoln, Colorado, United States; citing sheet 1A, family 1, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,167.
"United States Census, 1930," database with images, FamilySearch https://familysearch.org/ark:/61903/1:1:X7W8-K3M : accessed 24 August 2015), Helone B Nilsen in household of David A Leathers, Grover, Weld, Colorado, United States; citing enumeration district (ED) 0049, sheet 1B, family 21, line 73, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 252; FHL microfilm 2,339,987.
"Colorado Statewide Marriage Index, 1853-2006," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KNQ8-3LV : accessed 4 April 2015), Andrew G Laird and Helene B Nielsen, 02 Feb 1937, Denver, Denver, Colorado, United States; citing p. 8983, State Archives, Denver; FHL microfilm 1,690,098 .
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9DD-GKT : accessed 8 April 2015), Helene B Laird in household of Andrew G Laird, Ward 5, Stockton, O'Neal Judicial Township, San Joaquin, California, United States; citing enumeration district (ED) 39-60, sheet 10B, family 277, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 325.
"California, Death Index, 1940-1997," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VGGT-F5K : accessed 19 Oct 2014), Nielsen in entry for Helene Nielsen Laird, 06 Feb 1983; citing Department of Public Health Services, Sacramento.
"United States Social Security Death Index," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VM91-9P1 : accessed 31 Oct 2014), Helene N Laird, 06 Feb 1983; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"California, San Joaquin, County Public Library Obituary Index, 1850-1991", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VR82-568 : Thu Nov 16 22:58:09 UTC 2023), Entry for Helene Nielsen Laird, 1983.
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It may be possible to confirm family relationships with Helene by comparing test results with other carriers of her mitochondrial DNA.
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