Items where Year is 1991
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Korzyukov, A. I. and Koshelev, A. I. and Serebryakov, V. V. (1991) Recent status of Mute Swans Cygnus olor in the Ukraine, USSR. Wildfowl: Supplement (1). pp. 49-52.
Korzyukov, A. I. and Koshelev, A. I. and Serebryakov, V. V. (1991) Recent status of Mute Swans Cygnus olor in the Ukraine, USSR. Wildfowl: Supplement (1). pp. 49-52.