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- [S9901] GEDCOM file imported on 18 March 2013.
- [S9904] Public Member Trees, Database online.
Record for Harvtvig Johannes Irgens
- [S9919] Vore Eidsvollsmænds efterkommere. Gjennem alle linjer i 100 aar, Johan Bergwitz, (Kristiania, 1914).
- [S9999] Philadelphia Passenger Lists, 1800-1945 about Nelly Billingham.
http://search.ancestry.com/cgi-bin/sse.dll?indiv=1&db=philadelphiapl&r ank=1&new=1&MSAV=1&msT=1&gss=angs-d&gsfn=Nelly&gsfn_x=1&gsln=Billingha m&gsln_x=1&msbdy=1870&msbpn__ftp=USA&cpxt=0&uidh=3e5&msbdp=2&cp=0&pcat =IMG_PASSLISTS&fh=0&h=113927&recoff=6+7
- [S10000] Sl?gten Magnus, Kristiania 1909, http://www.wangensteen.net/Bibliotek/magnus/index.html#/16/.
- [S9905] Slekten Irgens; Ludvig Kr. Langberg, Oslo 1927.
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