"Illinois, Northern District Naturalization Index, 1840-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XKLD-LYZ : 12 March 2018), Adam Boysen, 1886; citing Waterloo, Iowa, NARA microfilm publication M1285 (Washington D.C.: National Archives and Records Administration, n.d.), roll 11; FHL microfilm 1,432,011.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XV6K-WY9 : 11 March 2018), Adam Boysen in entry for Boysen, 13 Jul 1886; citing New Hartford, Butler, Iowa, United States; county district courts, Iowa; FHL microfilm 1,035,396.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9KS-TXQ : accessed 30 October 2018), Adam Bojson, Cedar Falls city Ward 1 & 4, Black Hawk, Iowa, United States; citing enumeration district (ED) 6, sheet 21A, family 419, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,417.
"Iowa State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2SZ2-5RX : 16 March 2018), Adam Boysen, Black Hawk, Iowa, United States; citing card #B330, State Historical Department, Des Moines; FHL microfilm 1,430,275.
"Iowa State Census, 1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK4R-75MR : 17 March 2018), Adam Boysen, 1915; citing Black Hawk, Iowa, United States, card no. , Iowa State Historical Department, Des Moines; FHL microfilm 1,379,476.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8YB-C75 : accessed 30 October 2018), Adam Boyson, Cedar Falls Ward 1, Black Hawk, Iowa, United States; citing ED 7, sheet 2B, line 65, family 53, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 478; FHL microfilm 1,820,478.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMNC-FYG : accessed 30 October 2018), Adam Boysen, Cedar Falls, Black Hawk, Iowa, United States; citing enumeration district (ED) ED 8, sheet 12A, line 19, family 311, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 642; FHL microfilm 2,340,377.
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