Publication
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Reconsideration of the so-called Oligocene fauna in the asphaltic deposits of Buton (Malay Archipelago) — 1. Mio-Pliocene Mollusca Article
Leidse Geologische Mededelingen, 17(1), 237-258.January 1952
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Untersuchungen an Varlamoffit Article
Leidse Geologische Mededelingen, 17(1), 207-214.January 1952
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Reconsideration of the so-called Oligocene fauna in the asphaltic deposits of Buton (Malay Archipelago) — 3. Report on Diatoms Article
Leidse Geologische Mededelingen, 17(1), 294-297.January 1952
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IV. Dacryodes in New Guinea Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 7(1), 167-170.January 1952
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Mimusops L Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(3), 594-595.January 1952
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Scandent Burseraceae (Dacryodes and Canarium) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 7(1), 163-167.January 1952
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Itinerary in Kenya colony and the union of South America Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 7(1), 297-302.January 1952
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A monograph of the Vochysiaceae. II. Callisthene Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 108(1), 222-242.January 1952