Publication
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De atollen en barrière-riffen der Togian-eilanden Article
Leidse Geologische Mededelingen, 11(1), 132-187.January 1939
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De geologie van het Valle di Scalve en het Valle Nembro Bijdrage tot de geologie van de Bergamasker Alpen No. 18 Article
Leidse Geologische Mededelingen, 11(1), 267-360.January 1939
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Geological results of the Carstensz Expedition 1936 Article
Leidse Geologische Mededelingen, 11(1), 68-131.January 1939
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Die Königlich Zoologische Gesellschaft „Natura Artis Magistra” und die Tierpsychologie Article
Bijdragen tot de dierkunde, 27(1), 31-52.January 1939
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Botanical results of a trip to the Salajar islands Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 3(2), 236-237.January 1939
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Notes on Javanese Calcicole Cyanophyceae Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 3(2), 243-247.January 1939
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The dates of publication of Blume’s Flora Javae Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 3(2), 203-211.January 1939
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The Convolvulaceae of Malaysia, II Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 3(2), 267-371.January 1939