Publication
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On some brackish Water Mollusca from the Lake of Maracaibo Article
Zoologische Mededelingen, 31(8), 79-87.January 1950
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Annotated List of Phyto-Taxonomical and Phyto-Geographical Publications on or of Importance to the Malaysian Region Article
Flora Malesiana Bulletin, 7(1), 236-256.January 1950
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On some Balanids living in Corals, collected by the Snellius Expedition in 1930 Article
Zoologische Mededelingen, 30(19), 289-296.January 1950
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A Note on the Charadriiformes listed for Sumatra by Robinson & Kloss, 1918 and 1923 Article
Zoologische Mededelingen, 30(22), 309-310.January 1950
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Note on the Floral morphology of Mabea (Euph.) Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 104(1), 65-69.January 1950
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Some Remarks concerning subspecies of Ducula aenea from Celebes and surrounding Islands Article
Zoologische Mededelingen, 30(18), 283-288.January 1950
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The Life of Natrix vittata (L.) Article
Zoologische Mededelingen, 31(1), 1-11.January 1950
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Scientific Results of the Surinam Expedition 1948-1949 : Part II. Zoology. No. 1. Crustacea Decapoda Macrura Article
Zoologische Mededelingen, 31(3), 25-37.January 1950