Publication
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Report on the Syrphid Flies, collected by the „Fourth Dutch Karakorum Expedition, 1935” Article
Beaufortia, 5(47), 47-51.January 1955
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Review. Flower morphology, a source of evidence for evolution as a physiological process Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(1), 195-199.January 1955
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Florae Malesianae Precursores X. Notes on Malaysian and some S. E. Asian Cyperaceae III Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(1), 110-169.January 1955
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Experimental abrasion of pebbles I. Wet sandblasting Article
Leidse Geologische Mededelingen, 20(1), 142-150.January 1955
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Notes on Guiana Droseraceae Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 126(1), 136-138.January 1955
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Parnassiana nova : IV. Kritische revision der Gattung Parnassius (Fortsetzung 2) Article
Zoologische Mededelingen, 33(17), 127-156.January 1955
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Parnassiana nova : VII. Kritische Revision der Gattung Parnassius (Fortsetzung 4) Article
Zoologische Mededelingen, 34(1), 1-16.January 1955
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Rhizocephalan parasites of the crab Pugettia brevirostris, with notes on Sacculina gracilis Article
Zoologische Mededelingen, 33(24), 237-249.January 1955