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- [S470] Folketelling USA 1925, New York State Archives; Albany, New York; State Population Census Schedules, 1925; Election District: 11; Assembly District: 02; City: Oyster Bay; County: Nassau; Page: 20 (Troverdighet: 3).
- [S238] Find a grave, (USA), https://www.findagrave.com/memorial/14036815/clarence-andersen (Troverdighet: 3).
Accessed 30 October 2023, memorial page for Clarence Andersen (1912– 24 Mar 1959), Find a Grave Memorial ID 14036815, citing East Hillside Cemetery, Glen Head, Nassau County, New York, USA; Maintained by Groovy Ghoulie (contributor 46836047).
- [S46] Ancestry.com, U.S., Evangelical Lutheran Church in America Church Records, 1781-1969 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2015. (Troverdighet: 3).
- [S82] Folketelling USA 05.01.1920, Folkräkningsplats: Jersey City Ward 7, Hudson, New Jersey; Rulle: T625_1045; Sida: 8A; Räkningsdistrikt:: 174 (Troverdighet: 3).
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