Publication
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On a collection of East Asian fishes Article
Zoologische Mededelingen, 35(7), 69-78.January 1957
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The Zoological Exploration of Suriname Article
Studies on the Fauna of Suriname and other Guyanas, 1(1), 1-12.January 1957
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Variations in length and breadth of eggs from a colony of black-headed gulls (Larus r. ridibundus Linnaeus) on the island of Texel Article
Beaufortia, 5(67), 245-255.January 1957
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Geological map of the Paleozoic of the Central Pyrenees Article
Leidse Geologische Mededelingen, 22(1), 351-418.January 1957
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The Devonian of the upper part of the Valle de Aran, Central Pyrenees Article
Leidse Geologische Mededelingen, 22(1), 491-500.January 1957
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Voorlopige resultaten van de kartering in N. Spanje verkregen in 1956 door L.U. de Sitter en medewerkers Article
Leidse Geologische Mededelingen, 22(1), 77-95.January 1957
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Data on the mineralogy and petrology of the dolomite-bearing northern contact zone of the Quérigut granite French Pyrenees Article
Leidse Geologische Mededelingen, 22(1), 235-349.January 1957
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Obituary notes Article
Flora Malesiana Bulletin, 13(1), 547-549.January 1957