"Colorado Naturalization Records, 1876-1990," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2SB-23JP : 25 July 2019), Bengt Agust Nelson, 1894; 1894; citing NAID 1307044 Naturalization Cards, 1880 - 1906. Records of District Courts of the United States, 1685 - 2009, RG 21 or Records of the Immigration and Naturalization Service, RG 85. National Archives at Denver; FHL microfilm 100,664,686.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQM3-K6T : accessed 21 August 2019), August Nelson, Precincts 5, 7, 11-12, parts of 2-3, 6, 14 West Castle Rock (west portion) Castle Rock town, Douglas, Colorado, United States; citing enumeration district (ED) 173, sheet 3A, family 65, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,120.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKW5-46R : accessed 21 August 2019), Gus B Nelson, Sedalia, Douglas, Colorado, United States; citing enumeration district (ED) ED 14, sheet 2A, family 19, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 114; FHL microfilm 1,374,127.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX2Z-GCZ : accessed 21 August 2019), B August Nelson, Kelley, Douglas, Colorado, United States; citing ED 62, sheet 1A, line 21, family 6, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 157; FHL microfilm 1,820,157.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7WL-7SC : accessed 21 August 2019), Gus B Nelson, Castle Rock, Douglas, Colorado, United States; citing enumeration district (ED) ED 4, sheet 5B, line 60, family 218, 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://familysearch.org/ark:/61903/1:1:VR6W-BJ4 : 26 July 2019), Gus Nelson, Sedalia, Election Precinct 3, Douglas, Colorado, United States; citing enumeration district (ED) 18-3, sheet 7A, line 20, family 50, 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/11441408/bengt-august-nelson : accessed 11 October 2021), memorial page for Bengt August Nelson (9 Nov 1861–18 Sep 1945), Find A Grave: Memorial #11441408, citing Bear Canon Cemetery, Sedalia, Douglas County, Colorado, USA ; Maintained by sandy heffernon (contributor 46779496) .
Monumental inscription. United States. Bear Canon Cemetery, Sedalia, Colorado. 1945 (b. 1861) NELSON, BENGT A. GPS: n/a. Photo courtesy of Archives & Local History, Douglas County Libraries, Castle Rock, CO.
Record Journal of Douglas, 7 Jan 1949, Colorado Historic Newspapers Collection, Colorado State Library, Quarries of Castle Rock
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