Norweski geograf.

Kp. Norske fangstmenns og fiskeres ferder til Grønland 1922-1931 / Gunnar Isachsen og Fridtjov Isachsen. - Oslo, 1932.

oria.no, 4.04.2016 http://bibsys-almaprimo.hosted.exlibrisgroup.com/primo_library/libweb/action/search.do?fn=search&ct=search&initialSearch=true&mode=Basic&tab=default_tab&indx=1&dum=true&srt=rank&vid=BIBSYS&frbg=&vl%28freeText0%29=isachsen%2C+fridtjov&scp.scps=scope%3A%28BIBSYS_ILS%29%2Cscope%3A%28SC_OPEN_ACCESS%29%2Cscope%3A%28%22BIBSYS%22%29%2Cprimo_central_multiple_fe

no.wikipedia