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HELLEBREKERS WPJ (1961) Oölogische nidologische and communications, 1959-II and 1960. Five-clutch of the Black Tern Chlidonias niger. LIMOSA 34 (3): 265-265.Five-clutch of the Black Tern Chlidonias niger Black Tern Chlidonias niger[free pdf] [dutch summary]
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