Publication
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A study of the vegetation of the “Turfkoele” and of the Palynological character of the peat deposited in this swamp Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 144(1), 583-592.January 1957
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Cyanophyceae from fish-ponds in West-Java Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 518-521.January 1957
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Revision of the Sapotaceae of the Malaysian area in a wider sense. Va. Additional notes on Manilkara Adanson Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 204-206.January 1957
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Revision of the Sapotaceae of the Malaysian area in a wider sense. VII. Planchonella Pierre Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 235-445.January 1957
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Revision of the Sapotaceae of the Malaysian area in a wider side. VIII. Krausella H. J. Lam Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 446-451.January 1957
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Suriname Freshwater Snails of the Genus Pomacea Article
Studies on the Fauna of Suriname and other Guyanas, 1(1), 41-48.January 1957
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Expeditions and other exploration Article
Flora Malesiana Bulletin, 13(1), 556-560.January 1957
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Editorial Article
Flora Malesiana Bulletin, 13(1), 546-547.January 1957