Publication
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The “world’s largest toad” and other herpetological specimens from southern Suriname Article
Studies on the Fauna of Suriname and other Guyanas, 12(1), 159-171.January 1970
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Gerridae of Suriname and the Amazon with additional records of other neotropical species Article
Studies on the Fauna of Suriname and other Guyanas, 12(1), 94-138.January 1970
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Corixidae of Suriname and the Amazon with records of other neotropical species Article
Studies on the Fauna of Suriname and other Guyanas, 12(1), 43-70.January 1970
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Studies on South American Gomphidae (Odonata) Article
Studies on the Fauna of Suriname and other Guyanas, 11(1), 1-158.January 1970
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A reclassification of the species of Linyphia Latreille based on the functioning of the genitalia (Araneida, Linyphiidae) Part II. Microlinyphia Gerhardt and Frontinellina van Helsdingen Article
Zoologische Verhandelingen, 111(1), 1-86.January 1970
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Four new species and one new subspecies of the catfish genus Corydoras from Ecuador, Colombia and Brazil (Pisces, Siluriformes, Callichthyidae) Article
Beaufortia, 18(233), 119-132.January 1970
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Revision of the genera of the Chondracanthidae, a copepod family parasitic on marine fishes Article
Beaufortia, 17(229), 105-218.January 1970
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A Podostemacea new to Malaya: Indotristicha malayana Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(1), 152-155.January 1970