Czapulak, Andrzej
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1991: Wildfowl Special Issue No. 1 - SECTION ONE: DISTRIBUTION AND STATUS
Status of the Mute Swan, Cygnus olor and the Whooper Swan C. cygnus in Silesia (SW Poland)
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1991: Wildfowl Special Issue No. 1 - SECTION THREE: BREEDING
The breeding ecology of the Mute Swan Cygnus olor in Poland - preliminary report
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1991: Wildfowl Special Issue No. 1 - SECTION SIX: BIOMETRICS, PHYSIOLOGY AND GENETICS
Cygnus olor immutablis in Poland
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