Author: Tikhookeanskiĭ Komitet Akad.nauk Sssr I Gos. Russkoe Geograficheskoe Obshchestvo, Kamchatskai︠a︡ Ėkspedit︠s︡ii︠a︡ F.P.Ri︠a︡bushinskogo, Snari︠a︡zhennai︠a︡ Pri Sodeĭstvii Russk.geografich. O-Va , Geologicheskoe Otdelenie - Kel', N. G.

Source: Library of Congress - Maps

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