Publication
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A new Helota-species from Sumatra Article
Notes from the Leyden Museum, 20(4), 199-200.January 1899
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Die fossilien von Java auf grund einer sammlung von Dr. R. D. M. Verbeek Article
Sammlungen des Geologischen Reichs-Museums in Leiden. Neue Folge, 1(1), 133-332.January 1899
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Ueber Rhinoceros-Reste im Museum zu Leiden Article
Sammlungen des Geologischen Reichs-Museums in Leiden. Neue Folge, 2(1), 65-94.January 1899
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Neue Paussiden, mit einem biologischen Nachtrag Article
Notes from the Leyden Museum, 21(1/3), 33-52.January 1899
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On Alpheus hippothoë, de M. var.? Article
Notes from the Leyden Museum, 20(4), 210-210.January 1899
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On the „Diana” and the „Roloway” Article
Notes from the Leyden Museum, 20(4), 233-239.January 1899
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Zoological results of the Dutch Scientific Expedition to Central Borneo Article
Notes from the Leyden Museum, 21(1/3), 53-144.January 1899
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On the variability of characters in Perichaetidae Article
Notes from the Leyden Museum, 20(4), 201-209.January 1899