Publication
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The identity of Homaliopsis Sp. Moore Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(1), 4-4.January 1969
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Miscellaneous botanical notes XXI Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(2), 267-273.January 1969
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Materials for a monograph of the Meliaceae. I. A revision of the genus Vavaea Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(2), 351-366.January 1969
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The Presumed Pleistocene Glaciation of the Southeast Brazilian Itatiaia Mountains Article
Flora Malesiana Bulletin, 23(1), 1701-1703.January 1969
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Notes on the mouthparts of Eukoenenia mirabilis (Grassi) (Arachnidea: Palpigradida) Article
Zoologische Mededelingen, 44(3), 41-45.January 1969
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An annotated key to the South-East Asiatic, Malesian, Mascarene, and African species of Myriophyllum (Haloragaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(2), 303-311.January 1969
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Verspreiding en biologie van Haustorius arenarius, de zandvlokreeft, in Nederland (Crustacea, Amphipoda) Article
Zoologische Bijdragen, 11(8), 49-58.January 1969
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Odonata, Neuroptera en Trichoptera van Terschelling, met enkele aanvullingen van andere Wadden-eilanden Article
Zoologische Bijdragen, 11(2), 8-14.January 1969