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Wadden Sea Ecosystem 11: Contaminants in Bird Eggs in the Wadden Sea
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Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2000
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Wadden Sea Ecosystems 10: Breeding Birds in the Wadden Sea in 1996
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Harbour Seal Numbers in the Wadden Sea and on Helgoland in 1999
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Kees Dijkema: Salt marsh data from the 1970s
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