Publication
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Zoological Results of a Collecting Journey to Yugoslavia, 1954 5. Cyclopoida Gnathostoma (Crustacea Copepoda) Article
Beaufortia, 5(65), 223-240.January 1957
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Zoological Results of a Collecting Journey to Yugoslavia, 1954. 3. Süsswassermollusken mit Ausnahme der Sphaeriidae Article
Beaufortia, 5(60), 171-177.January 1957
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The species of Aplysia belonging to the subgenus Tullia Pruvot-Fol, 1933: On a generic character in statu nascendi Article
Beaufortia, 6(69), 83-114.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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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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Contribution to the Geology of the Central and Western Cordillera of Colombia in the sector between Ibagué and Cali Article
Leidse Geologische Mededelingen, 22(1), 1-75.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