Publication
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The female sex of Cacus mungo, Gomphoides undulatus, Planiplax phoenicura, Planiplax arachne and Dythemis williamsoni Article
Studies on the Fauna of Suriname and other Guyanas, 7(1), 36-47.January 1964
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Surinam Dragon Flies of the Genus Aphylla with a description of a new species Article
Studies on the Fauna of Suriname and other Guyanas, 7(1), 22-35.January 1964
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A new species of Pseudobba (Mollusca Gastropoda) from western New Guinea Article
Zoologische Mededelingen, 39(32), 308-310.January 1964
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De fossiele en recente walrussen van Nederland Article
Zoologische Mededelingen, 39(21), 187-205.January 1964
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A preliminary revision of the Indo-Pacific species of Ophioglossum (Ophioglossaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 12(2), 321-337.January 1964
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Notes on two small collections of Birds from new Guinea Article
Zoologische Verhandelingen, 66(1), 1-37.January 1964
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A new species of the genus Canacophilus Carl, 1926, from New Caledonia (Diplopoda, Polydesmida, Sphaerotrichopodidae) Article
Zoologische Mededelingen, 39(37), 369-374.January 1964
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The identity of the genus Austrobuxus Miq. (Euphorbiaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 12(2), 362-362.January 1964