Publication
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Upstream and downstream migrations in relation to the reproductive cycle and to environmental factors in the amphipod, Gammarus zaddachi Article
Bijdragen tot de dierkunde, 39(1), 11-43.January 1969
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Beiträge zur Kenntnis der Pupillacea : I. Die Spelaeodiscinae Article
Zoologische Mededelingen, 43(22), 287-306.January 1969
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Research in the Botany Department. University of Malaya, Kuala Lumpur Article
Flora Malesiana Bulletin, 24(1), 1795-1800.January 1969
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Biosystematic studies on Spergularia media and S. marina in the Netherlands IV. Reproduction, dissemination, karyogenetics and taxonomy Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 335(1), 639-650.January 1969
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Biosystematic studies of Spergularia media and S. marina in the Netherlands I. The morphological variability of S. media Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 332(1), 325-338.January 1969
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(2), 312-312.January 1969
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Copepods of the genus Scambicornus (Cyclopoida, Lichomolgidae) associated with Holothurians in the West Indies Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 29(1), 79-95.January 1969
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Editorial Article
Flora Malesiana Bulletin, 24(1), 1773-1774.January 1969