| Kilder |
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- [S727] Tromøy ministerialbok A 09 1878 - 1896. Tromøy sokn, Tromøy prgj, Aust-Agder, Konfirmerede 1894. Side 186 - nr. 18. Bernhard Bertelsen. (Troverdighet: 3).
- [S46] Ancestry.com, Index to Petitions for Naturalizations Filed in Federal, State, and Local Courts in New York City, 1792-1906; NAI Number: 5700802; Record Group Title: Records of District Courts of the United States, 1685-2009; Record Group Number: RG 21 (Troverdighet: 3).
- [S46] Ancestry.com, New York, USA, register över naturaliseringsansökningar i New York City, 1792-1989 [webbaserad databas]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2007. (Troverdighet: 3).
- [S46] Ancestry.com, U.S., Social Security Death Index, 1935-2014 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2014. (Troverdighet: 3).
- [S325] Tromøy klokkerbok B 04 1869 - 1877. Tromøy sokn, Austre Moland prgj, Aust-Agder, Ægteviede 1872. Side 121 - nr. 1. Ungkarl og styrmand Bertel Bertelsen og pige Anne Johanne Ilsen. (Troverdighet: 3).
- [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).
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