Krivonosov, G A
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1991: Wildfowl Special Issue No. 1 - SECTION ONE: DISTRIBUTION AND STATUS
The status and distribution of the Mute Swan Cygnus olor in the USSR: a review of recent censuses
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1991: Wildfowl Special Issue No. 1 - SECTION THREE: BREEDING
Mute Swans Cygnus olor breeding in the Volga Delta, USSR
Abstract PDF