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- [S2] Tvedestrand ministerialbok A 01 1885 - 1916. Tvedestrand sokn, Tvedestrand prgj, Aust-Agder, Levende fødte 1906. Side 84 - nr. 5. Arnfrid. (Troverdighet: 3).
- [S238] Find a grave, (USA), Memorial page for Arnfrid “Freddie” Petersen Olpp (4 Mar 1906–29 Apr 2000), Find a Grave Memorial ID 136627049, citing Curlew Hills Memory Gardens, Palm Harbor, Pinellas County, Florida, USA; Maintained by Iriss Hill (contributor 46617720). (Troverdighet: 3).
https://www.findagrave.com/memorial/136627049/arnfrid-olpp
- [S2] Tvedestrand ministerialbok A 01 1885 - 1916. Tvedestrand sokn, Tvedestrand prgj, Aust-Agder, I Ægteskab Indtraadte 1899. Side 209 - nr. 5. Rikard Pettersen Njerve og Hagny Eskildsen. (Troverdighet: 3).
- [S124] Folketelling USA 01.04.1950 (Troverdighet: 3).
Seventeenth Census of the United States, 1950; Record Group: Records of the Bureau of the Census, 1790-2007; Record Group Number: 29; Residence Date: 1950; Home in 1950: Huntington, Suffolk, New York; Roll: 5884; Sheet Number: 72; Enumeration District: 52-161A
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