Publication
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Phytogeographic notes on the Savanna flora of southern Surinam (South America) Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 306(1), 393-404.January 1968
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Lichens collected during a Dutch botanical East Greenland expedition to the Angmagssalik area in 1966 Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 305(1), 345-348.January 1968
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Morphological observations on Kozlowskiellina (Spiriferida) Article
Leidse Geologische Mededelingen, 44(1), 265-281.January 1969
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Ascidians of the family Styelidae from the Caribbean Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 30(1), 1-57.January 1969
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Three species of Microphthalmus (Polychaeta) new to The Netherlands Article
Zoologische Mededelingen, 43(23), 307-311.January 1969
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The Antillean Eleutherodactylus of the Auriculatus group Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 30(1), 99-115.January 1969
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Records of Antillean Water-striders (Heteroptera) Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 30(1), 72-87.January 1969
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Notes on Antillean Notonectidae Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 30(1), 88-98.January 1969