Publication
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Waarnemingen aan Hymenoptera-nesten II: Ceratina chalcites Latr. (Apidae), Xylocopa cyanescens Brullé (Apidae) en Gymnomerus laevipes Shuck. (Vespidae) Article
Entomologische Berichten, 33(6), 103-109.January 1973
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Macrolepidoptera in de Eifel Article
Entomologische Berichten, 33(6), 110-112.January 1973
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Badister anomalus Perr. (Coll.; Carabidae) Article
Entomologische Berichten, 33(6), 112-112.January 1973
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Notes on palaearctic Psenini (Hymenoptera, Sphecidae) Article
Entomologische Berichten, 33(6), 113-119.January 1973
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Bledius-materiaal Article
Entomologische Berichten, 33(6), 119-119.January 1973
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Observations on the behaviour of the primitively social bee, Evylaeus (= Halictus) calceatus Scop.: I. Preliminary Report on the general life history Article
Entomologische Berichten, 33(7), 121-127.January 1973
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Aantekeningen over Hyles gallii Rottemburg (Lep., Sphingidae) Article
Entomologische Berichten, 33(7), 128-131.January 1973
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Verslag Sphingiden-telling 1971 en aanvullingen op de telling van 1970 Article
Entomologische Berichten, 33(7), 132-136.January 1973