Publication
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The shifting of the molar row with regard to the orbit in Equus and Giraffa Article
Zoologische Mededelingen, 30(23), 311-326.January 1950
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Revision of the Lycoperdaceae of the Netherlands Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 480-516.January 1950
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Wood-anatomy and relationship. Taxonomic Notes in connection with the Key to the Javanese Woods Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 407-461.January 1950
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Nomenclatural changes in Spilanthes and Blainvillea with remarks and a key to the species of Spilanthes in the Malay Archipelago Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 349-354.January 1950
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The Algae transported on drifting objects and washed ashore on the Netherlands coast Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 527-543.January 1950
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Notes on the Flora of Java, VI Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 363-406.January 1950
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Two new species of Podolestes selys from Borneo, with a key for the identification of the known species (Odonata, Megapodagriidae) Article
Zoologische Mededelingen, 31(4), 39-47.January 1950
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On fossil Mollusca from the island of Mandul, East-Borneo Article
Leidse Geologische Mededelingen, 15(1), 291-304.January 1950