BERGH LMJ VAN DEN (1990) Waterfowl census in January 1988. LIMOSA 63 (2): 64-69.

IJsselmeer Waddenzee Delta Friesland Noord-Holland Grote rivieren Mute Swan Cygnus olor Bewick's Swan Cygnus bewickii Whooper Swan Cygnus cygnus Common Shelduck Tadorna tadorna Eurasian Wigeon Anas penelope Gadwall Anas strepera Garganey Anas querquedula Mallard Anas platyrhynchos Northern Pintail Anas acuta Northern Shoveler Anas clypeata Red-crested Pochard Netta rufina Common Pochard Aythya ferina Ferruginous Duck Aythya nyroca Tufted Duck Aythya fuligula Greater Scaup Aythya marila Common Eider Somateria mollissima Long-tailed Duck Clangula hyemalis Black Scoter Melanitta nigra Velvet Scoter Melanitta fusca Common Goldeneye Bucephala clangula Smew Mergellus albellus Red-breasted Merganser Mergus serrator Goosander Mergus merganser Common Moorhen Gallinula chloropus Eurasian Coot Fulica atra

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