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Birds of the North Gulf Coast, Prince William Sound region, Alaska
Isleib, M.E.
Bok Engelsk 1973
Birds of the Upper Sheenjek Valley, Northeastern Alaska
by Brina Kessel and George B. Schaller
Bok Engelsk 1960
Birds of the Colville River, northern Alaska
by Brina Kessel and Tom J. Cade
Bok Engelsk 1958