"Iowa, Church and Civil Births and Baptisms, 1837-1987", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XVJP-VJM : Wed Nov 15 04:07:31 UTC 2023), Entry for Albertson and Clarence George Albertson, 6 Dec 1910.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V4X4-4QS : 31 March 2020), Clarence George Albertson in entry for Albertson, 6 Dec 1910; citing Sioux Township, Sioux, Iowa, United States; county district courts, Iowa; FHL microfilm 1,404,847.
"Iowa State Census, 1915," , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QK4Y-9GDQ : 2 March 2022), Clarence Albertson, 1915; citing Sioux Township, Sioux, Iowa, United States, card no. , Iowa State Historical Department, Des Moines; FHL microfilm .
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KZ2X-4P8 : 29 December 2021), Clarence George Albertson, 1917-1918.
"Iowa, Old Age Tax Assistance Records, 1934-1958," , FamilySearch (https://familysearch.org/ark:/61903/1:1:QLWP-HDJZ : 12 September 2019), Clarence Albertson, ; citing Pension, Iowa, United States, multiple county Recorders, Auditors, and County Clerk Offices, Iowa; FHL microfilm 007897293.
"Iowa, Old Age Tax Assistance Records, 1934-1958," , FamilySearch (https://familysearch.org/ark:/61903/1:1:QLWP-HDJ7 : 12 September 2019), Clarence Albertson in entry for Alice Augusta Albertson, ; citing Pension, Iowa, United States, multiple county Recorders, Auditors, and County Clerk Offices, Iowa; FHL microfilm 007897293.
"Iowa, Old Age Tax Assistance Records, 1934-1958," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QLYR-2H96 : 12 September 2019), Clarence G Albertson, ; citing Pension, Iowa, United States, multiple county Recorders, Auditors, and County Clerk Offices, Iowa; FHL microfilm 007897292.
"Iowa, Old Age Tax Assistance Records, 1934-1958," , FamilySearch (https://familysearch.org/ark:/61903/1:1:QLYR-2H9V : 12 September 2019), C G Albertson in entry for Alice Augusta Albertson, ; citing Pension, Iowa, United States, multiple county Recorders, Auditors, and County Clerk Offices, Iowa; FHL microfilm 007897292.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKCH-7XWR : 10 March 2021), Clarence George Albertson, 27 Apr 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JYB9-BPJ : 10 January 2021), Clarence Albertson, Dec 1965; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, Social Security Numerical Identification Files (NUMIDENT), 1936-2007", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6KW9-MXJG : 10 February 2023), Clarence G Albertson in entry for Alice Albertson Bahnson, .