Publication
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Nomenclatuur Article
Entomologische Berichten, 13(298), 53-54.January 1950
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On mounting Aphids and other soft-skinned insects Article
Entomologische Berichten, 13(298), 55-58.January 1950
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Tenth series of notes on systematics and synonymy Article
Entomologische Berichten, 13(298), 59-61.January 1950
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Systematic and synonymical notes on New World clerid beetles (Coleoptera) Article
Entomologische Berichten, 13(298), 61-62.January 1950
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Kinderspel met spinnen. Article
Entomologische Berichten, 13(298), 62-62.January 1950
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Siphonaptera Neerlandica faunae nova species, II Article
Entomologische Berichten, 13(298), 63-64.January 1950
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Overlast door rupsen van Charanyca clavipalpis F. Article
Entomologische Berichten, 13(298), 64-64.January 1950
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Vroege vlinders. Article
Entomologische Berichten, 13(298), 64-64.January 1950