Publication
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Hirudinea of the genus Helobdella from Curaçao and Venezuela Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 3(1), 87-88.January 1948
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Prehistoric teeth of man and of the orang-utan from Central Sumatra, with notes on the fossil orang-utan from Java and Southern China Article
Zoologische Mededelingen, 29(2), 175-301.January 1948
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Personal news Article
Flora Malesiana Bulletin, 3(1), 56-57.January 1948
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The Geology of the Bergamasc Alps Lombardia Italy Article
Leidse Geologische Mededelingen, 14(2), 1-257.January 1949
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Pollenanalytisch en Geologisch onderzoek van het Onder- en Midden-Pleistoceen van Noord-Nederland Article
Leidse Geologische Mededelingen, 14(2), 258-346.January 1949
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Notes on a small collection of Hydroids from Jersey (Channel Islands) Article
Zoologische Mededelingen, 30(11), 133-162.January 1949
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The snakes of Somaliland and the Sokotra Islands Article
Zoologische Verhandelingen, 6(1), 1-115.January 1949
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State of progress in Malaysian plant taxonomy Article
Flora Malesiana Bulletin, 5(1), 126-127.January 1949