Publication
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Cytotaxonomic studies in the genus Symphytum. II. Crossing experiments between Symphytum officinale L. and Symphytum asperum Lepech Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 325(1), 544-549.January 1969
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A reidentification of the Australian Muridae in the Leiden Museum listed by F. A. Jentink in 1887 and 1888 Article
Zoologische Mededelingen, 43(21), 279-286.January 1969
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Notes on European polypores-III. Notes on species with stalked fruitbody Article
Persoonia - Molecular Phylogeny and Evolution of Fungi, 5(3), 237-263.January 1969
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The Amphibia of Trinidad Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 29(1), 1-78.January 1969
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Myrtle Lake: a late- and post-glacial pollen diagram from northern Minnesota Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 314(1), 1397-1408.January 1969
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Biosystematic studies on Spergularia media and S. marina in the Netherlands II. The morphological of S. marina Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 333(1), 467-476.January 1969
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Studies on Opilioacarida (Arachnida) III. Opilioacarus platensis Silvestri, and Adenacarus arabicus (With) Article
Zoologische Mededelingen, 44(8), 113-131.January 1969
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Joseph Gaertner and his Carpologia Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 321(1), 216-223.January 1969