text: Лист карты U-40-XXVIII,XXIX,XXX о. Циглера. Масштаб: 1 : 200 000. Издание 1965 г. Toward Magnetic North By: Ernest Carl Oberholtzer The Oberholtzer Foundation, Toward Magnetic North: The Oberholtzer-Magee 1912 Canoe Journey to Hudson Bay Artic Profiles: Ernest C. Oberholtzer