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- [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).
- [S241] Folketelling USA 01.04.1940, Census Place: New York, Kings, New York; Roll: m-t0627-02574; Page: 61A; Enumeration District: 24-1075 (Troverdighet: 3).
- [S238] Find a grave, (USA), https://www.findagrave.com/memorial/187328160/george-gjertsen (Troverdighet: 3).
Accessed 27 December 2023, memorial page for George Gjertsen (11 Nov 1916– 15 Jun 1998), Find a Grave Memorial ID 187328160, citing Fred Hunter's Hollywood Memorial Gardens East, Hollywood, Broward County, Florida, USA; Maintained by ken jackson (contributor 48742601).
- [S12] Dypvåg klokkerbok B 14 1901 - 1922. Dypvåg sokn, Dypvåg prgj, Aust-Agder, I Ægteskab Indtraadte 1909. Side 180 - nr. 6. Georg Andreas Gjertsen og Gurine Konstanse Knudsen. (Troverdighet: 3).
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