Numbers and distribution of waterbirds in the Wadden Sea : result and evaluation of 36 simultaneous counts in the Dutch-German-Danish Wadden Sea 1980-1991 - Meltofte, Hans; International Waterfowl and Wetlands Research Bureau; Common Secretariat for the Cooperation on the Protection of the Wadden Sea (Denmark : Common Secretariat for the Cooperation on the Protection Wadden Sea, 1994)
Keywords: Water birds -- Netherlands -- Waddenzee; Bird populations -- Netherlands -- Waddenzee