Publication
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Florae Malesianae Praecursores L. A revision of Lepisanthes (Sapindaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(1), 33-91.January 1969
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The structure of the SW part of the Cantabrian Mountains Article
Leidse Geologische Mededelingen, 43(1), 213-215.January 1969
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Expeditions and other exploration Article
Flora Malesiana Bulletin, 23(1), 1684-1688.January 1969
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Obituaries and biographical notes Article
Flora Malesiana Bulletin, 23(1), 1674-1675.January 1969
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Reviews Article
Flora Malesiana Bulletin, 24(1), 1818-1821.January 1969
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A study on the diversity of island floras Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(1), 139-178.January 1969
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Materials towards the knowledge of the Icacinaceae of Asia, Malesia, and adjacent areas Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(1), 181-264.January 1969
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Studies in the family Thelypteridaceae. The genera Phegopteris, Pseudophegopteris, and Macrothelypteris Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 17(1), 5-32.January 1969