Publication
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The Heteroptera of the Netherlands Antilles – VIII Pleidae, Naucoridae, Ranatridae Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 30(1), 58-71.January 1969
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Octocorallia from North-Western Madagascar (Part I) Article
Zoologische Verhandelingen, 106(1), 1-38.January 1969
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Carboniferous Productidina and Chonetidina of the Cantabrian Mountains (NW Spain): Systematics, stratigraphy and palaeoecology Article
Leidse Geologische Mededelingen, 43(1), 41-126.January 1969
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The Lac-Croche plutonic complex, Quebec: basement of Grenville paragneisses? Article
Leidse Geologische Mededelingen, 43(1), 1-7.January 1969
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Provisional geological map of the Southern Cantabrian Mountains (Spain) Article
Leidse Geologische Mededelingen, 43(1), 217-220.January 1969
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Notes on the morphology of Alycus roseus C. L . Koch Article
Zoologische Mededelingen, 43(15), 177-202.January 1969
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The Heteroptera of the Netherlands Antilles – VII Corixidae Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 28(1), 135-164.January 1969
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Two new taxa and three new combinations in East African Adenia (Passifloraceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(1), 179-180.January 1969