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Ganzen- en zwanentellingen in Nederland in 1998/99
(2000). Ganzen- en zwanentellingen in Nederland in 1998/99. SOVON-monitoringrapport, 2000/03. SOVON Vogelonderzoek Nederland: Beek-Ubbergen. 66 + bijlagen pp.
Part of: SOVON-monitoringrapport. SOVON Vogelonderzoek Nederland: Beek-Ubbergen. ISSN 1874-169X, more