van Haperen, Anton
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Wildfowl 32 - Articles
Numbers and distribution of wild geese in the Netherlands, 1974-1979
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Wildfowl 37 - Articles
Numbers and distribution of wild geese in The Netherlands, 1979-1984
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Wildfowl 43 - Standard Papers
Numbers and distribution of wild geese in the Netherlands, 1984-89, with special reference to weather conditions
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