Kondratiev, A Ya
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1991: Wildfowl Special Issue No. 1 - SECTION ONE: DISTRIBUTION AND STATUS
The distribution and status of Bewick's Swans Cygnus bewickii, Tundra Swans C. columbianus and Whooper Swans C. cygnus in the "Extreme Northeast" of the USSR
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1991: Wildfowl Special Issue No. 1 - SECTION THREE: BREEDING
Breeding biology of Bewick's Swans Cygnus bewickii in Chukotka, Far Eastern USSR
Abstract PDF