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The Snowy Owl. (Die Schnee-Eule, Nyctea scandiaca)

by Kelso, Leon, Portenko, L.
Published in Bird-Banding (1974)

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2

Birds of Chukotsk Peninsula and Wrangel Island. Part I. (Ptitsy Chukotskogo poluostrova i ostrova Vrangelya. Chast I)

by Kelso, Leon, Portenko, L. A.
Published in Bird-Banding (1972)

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3

Birds of the Chukchi Peninsula and Wrangel Island = (Ptitsy Chukotskogo poluostrova i ostrova Vrangelya)

by Portenko, L. A. (Leonid Aleksandrovich), 1896-1972

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4

Birds of the Chukchi Peninsula and Wrangel Island = (Ptitsy Chukotskogo poluostrova i ostrova Vrangelya)

by Portenko, L. A. (Leonid Aleksandrovich), 1896-1972
Published 1981

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5

Birds of the Chukchi Peninsula and Wrangel Island = (Ptitsy Chukotskogo poluostrova i ostrova Vrangelya)

by Portenko, L. A. (Leonid Aleksandrovich), 1896-1972

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