Publication
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On the structure and systematic position of the Genus Rhipidocrinus Beyrich, 1879 Article
Leidse Geologische Mededelingen, 25(1), 247-260.January 1960
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Nomenclatural note on Cardiopteris Article
Flora Malesiana Bulletin, 15(1), 725-726.January 1960
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Report by dr R.E. Holttum on his round-the-world trip 1959-60 Article
Flora Malesiana Bulletin, 15(1), 743-746.January 1960
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Book reviews Article
Flora Malesiana Bulletin, 15(1), 749-755.January 1960
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Simaroubaceae Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 193-226.January 1960
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Palynologische untersuchung des vorderen Filzmooses am Warscheneck (Steiermark) Article
Leidse Geologische Mededelingen, 26(1), 59-63.January 1961
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Note sur le bassin Houiller de Sabero, Espagne Article
Leidse Geologische Mededelingen, 26(1), 51-58.January 1961
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Notes upon some Sea Turtles Article
Zoologische Verhandelingen, 51(1), 1-46.January 1961