Publication
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In memoriam Professor Dr. Lieven Ferdinand de Beaufort Article
Beaufortia, 16(221), 200-213.January 1969
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A cyclopoid copepod, Sewellochiron fidens n. gen., n. sp., associated with a medusa in Puerto Rico Article
Beaufortia, 16(219), 171-183.January 1969
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Catalogue of the type specimens of Tunicata in the Zoological Museum in Amsterdam Article
Bulletin Zoologisch Museum, 1(13), 157-201.January 1969
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The synonymy of Sagitta planctonis and Sagitta zetesios (Chaetognatha) Article
Bulletin Zoologisch Museum, 1(10), 125-129.January 1969
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Essais d’hybridisation entre Gammarus aequicauda (Martynov, 1931) et Gammarus plumicornis Costa, 1853 Article
Bulletin Zoologisch Museum, 1(12), 153-156.January 1969
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Mappable units of the Carboniferous in the Southern Cantabrian Mountains (NW-Spain) Article
Leidse Geologische Mededelingen, 43(1), 221-231.January 1969
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Geology of the Luna-Sil region, Cantabrian Mountains (NW Spain) Article
Leidse Geologische Mededelingen, 44(1), 137-225.January 1969
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Carboniferous Sphinctozoa from the Cantabrian Mountains, Spain Article
Leidse Geologische Mededelingen, 42(1), 239-245.January 1969