Publication
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Notes on the genus Digitaria, with descriptions of new species Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 1(1), 90-114.January 1934
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The Cornaceae, Sensu Stricto, of the Netherlands Indies Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 1(1), 46-74.January 1934
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Editorial Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 1(1), 4-6.January 1934
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Artificial key to the Orchid Genera of the Netherlands Indies, together with those of New Guinea, the Malay Peninsula and the Philippines Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 1(1), 194-215.January 1934
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Über Vögel, gesammelt von Dr. F. Kopstein auf den Süd-Molukken und Tenimber 1922 - 1924 Article
Zoologische Mededelingen, 17(4), 15-19.January 1934
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Un nouveau sous-genre de Camponotus (Hymenoptera Formicidae) de La Malaisie avec description de formes nouvelles, récoltées par M. F. G. Nainggolan Article
Zoologische Mededelingen, 17(5), 20-30.January 1934
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Zenarchopterus-Studien Article
Zoologische Mededelingen, 17(3), 11-14.January 1934
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Contributions to Indo-Australian Herpetology Article
Zoologische Mededelingen, 17(9), 161-251.January 1934