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HELLEBREKERS WPJ (1970) Oölogische nidologische and announcements in 1970 (and earlier): Melanistic duck eggs Mallard Anas platyrhynchos. LIMOSA 43 (3): 152-152.Mallard Anas platyrhynchos Melanistic duck eggs Mallard Anas platyrhynchos[free pdf] [dutch summary]
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