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Ganzen- en zwanentellingen in Nederland in 1999/2000
(2001). Ganzen- en zwanentellingen in Nederland in 1999/2000. SOVON-monitoringrapport, 2001/06. SOVON Vogelonderzoek Nederland: Beek-Ubbergen. 68 + bijlagen pp.
Part of: SOVON-monitoringrapport. SOVON Vogelonderzoek Nederland: Beek-Ubbergen. ISSN 1874-169X, more