Publication
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The Podostemaceae of the New World. Part I Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 107(1), 1-150.January 1951
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A taxonomic study of the Phytoseiinae (Family Laelaptidae) Predaceous upon Tetranychidae of Economic importance Article
Zoologische Verhandelingen, 12(1), 1-64.January 1951
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Rediagnosis of the Old World Cyprinodont genus Aphanius Article
Beaufortia, 1(1), 1-6.January 1951
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The Oribatei (Acari) of the Netherlands Article
Zoologische Verhandelingen, 17(1), 1-139.January 1952
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Records and description of Microlepidoptera (5) Article
Zoologische Mededelingen, 31(16), 165-178.January 1952
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On some Indo-westpacific Palaemoninae (Crustacea Decapoda Caridae) Article
Zoologische Mededelingen, 31(18), 201-211.January 1952
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Some remarks on the subspecies of Phalanger ursinus (Temminck) and of Lenomys meyeri (Jentink) from Celebes Article
Zoologische Mededelingen, 31(21), 233-246.January 1952
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Notes on the Thysanura (Insecta, Apterygota) of the Canary Islands Article
Zoologische Mededelingen, 31(20), 225-232.January 1952