Publication
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Rivea laotica, a new species from Indo-China (Convolvulaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 525-527.January 1957
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Revision of the Sapotacea of the Malysian area in a Winder sense. IVb. Ganua Pierre ex Dubard (2nd Supplement) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 510-513.January 1957
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A systematic review of the Indo-Australian Zosteropidae (Part I) Article
Zoologische Verhandelingen, 35(1), 1-204.January 1957
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Notes on the Ichthyology of Surinam (Dutch Guiana), 4 Additional records of Siluriform Fishes (1) Article
Beaufortia, 6(71), 147-160.January 1957
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Zoological Results of a Collecting Journey to Yugoslavia, 1954. 2. Freilebende Nematoden aus dem Ohrid-See Article
Beaufortia, 5(59), 157-170.January 1957
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On the Influence of Preservation on the External Appearance of Specimens of Aplysia depilans Linné Article
Beaufortia, 5(66), 241-243.January 1957
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Das Verhalten von Nannostomus beckfordi aripiragensis Meinken, mit einer Besprechung der Schwimmblasenfunktion Article
Beaufortia, 6(75), 203-220.January 1957
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De stand van de Ooievaar, Ciconia c. ciconia (Linné), in Nederland in 1956 (The Status of the White Stork in the Netherlands in the Year 1956) Article
Beaufortia, 5(63), 187-204.January 1957