Publication
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The Anatomy of Natrix vittata (L.) Article
Zoologische Mededelingen, 31(2), 13-24.January 1950
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 544-545.January 1950
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Revisie van de Nederlandse Gentianaceae, I. Centaurium Hill Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 99(1), 169-198.January 1950
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Notes on Sacculinidae, chiefly in the collection of the United States National Museum Article
Zoologische Verhandelingen, 7(1), 1-55.January 1950
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The genus Onchocalanus G.O. sars, 1905 (Crustacea Copepoda) Article
Zoologische Verhandelingen, 10(1), 1-35.January 1950
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A new Trigonia from Suriname Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 105(1), 69-69.January 1950
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The marine Mollusca of the Kendeng Beds (East Java) Gastropoda Part V (Families Muricidae — Volemidae inclusive) Article
Leidse Geologische Mededelingen, 15(1), 205-240.January 1950
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On probably young miocene fossils from the coal concession Batoe Panggal, near Tenggarong (Samarinda), Eastern Borneo Article
Leidse Geologische Mededelingen, 15(1), 265-281.January 1950