Publication
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Morphological observations with systematic implications on some palaeozoic Rhynchonellida from Europe, with special emphasis on the Uncinulidae Article
Leidse Geologische Mededelingen, 41(1), 1-82.January 1968
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Geology of the Leonides between the Bernesga and Porma rivers, Cantabrian Mountains, NW Spain Article
Leidse Geologische Mededelingen, 41(1), 83-151.January 1968
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Florarctus antillensis, a new Tardigrade from the coraL sand of Curaçao Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 26(1), 140-146.January 1968
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The daily colour rhythm of the fiddler crab Uca rapax on Curaçao Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 25(1), 58-72.January 1968
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The Common Marine Isopod Crustacea of Puerto Rico A handbook for marine biologists Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 27(1), 1-133.January 1968
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Polycladida from Curaçao and faunistically related regions Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 26(1), 1-133.January 1968
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Notonectidae of Suriname with additional records of other neotropical species Article
Studies on the Fauna of Suriname and other Guyanas, 10(1), 110-136.January 1968
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Insect collecting in Suriname with the help of “Malaise” traps Article
Studies on the Fauna of Suriname and other Guyanas, 10(1), 101-109.January 1968