Publication
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Progress in Malesian botany Article
Flora Malesiana Bulletin, 24(1), 1780-1783.January 1969
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Endemism Article
Flora Malesiana Bulletin, 24(1), 1817-1817.January 1969
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Palynological work on Malesian taxa at Leiden Article
Flora Malesiana Bulletin, 24(1), 1802-1802.January 1969
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Notes on differences between some external and skull characters of Microtus arvalis (Pallas, 1778) and of Microtus agrestis (Linnaeus, 1761) from the Netherlands Article
Zoologische Mededelingen, 44(6), 83-108.January 1969
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Recent Foraminifera from Barbados Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 31(1), 1-158.January 1969
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Notes on the Herpetology of the U.S. Naval Base at Guantanamo Bay, Cuba Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 31(1), 159-201.January 1969
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Editorial Article
Flora Malesiana Bulletin, 23(1), 1669-1673.January 1969
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Bibliography Article
Flora Malesiana Bulletin, 23(1), 1713-1771.January 1969