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- [S414] USA registreringskort 2. verdenskrig, Wwii Draft Registration Cards For New York City, 10/16/1940 - 03/31/1947; Registergrupp: Records of the Selective Service System, 147 (Troverdighet: 3).
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- [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).
- [S32] Avis, The Journal News, White Plains, New York Monday, February 9, 1981 (Troverdighet: 3).
- [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).
- [S32] Avis, The Minneapolis Star, Minneapolis, Minnesota Sunday, December 1, 1940 (Troverdighet: 3).
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