| Kilder |
- [S534] Grimstad ministerialbok A 02 1882 - 1912. Grimstad sokn, Grimstad prgj, Aust-Agder, Levende fødte 1893. Side 120 - nr. 40. Inga. (Troverdighet: 3).
- [S534] Grimstad ministerialbok A 02 1882 - 1912. Grimstad sokn, Grimstad prgj, Aust-Agder, Konfirmerede 1908. Side 351 - nr. 23. Inga Olsen. (Troverdighet: 3).
- [S277] Nordisk Tidende, New York, USA, (New York, USA.), 12.02.1970 (Troverdighet: 3).
- [S277] Nordisk Tidende, New York, USA, (New York, USA.), 02.04.1964 (Troverdighet: 3).
- [S241] Folketelling USA 01.04.1940 (Troverdighet: 3).
Thorolf Berntsen, Assembly District 7, Brooklyn, New York City, Kings, New York, United States; citing enumeration district (ED) 24-845, sheet 61A, line 10, family 97, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2568.
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