Publication
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The distribution of Ischnura gemina (Kennedy) and a description of the andromorph female (Zygoptera: Coenagrionidae) Article
Odonatologica, 10(2), 85-91.January 1981
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Some little-known species of Risiocnemis Cowley from the Philippine Islands, with notes on their synonymy, morphological characters and larval structure (Zygoptera: Platycnemididae) Article
Odonatologica, 10(2), 93-107.January 1981
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Zur taxonomie einiger Crocothemis-Arten, nebst Beschreibung einer neuen Art von Madagaskar (Anisoptera: Libellulidae) Article
Odonatologica, 10(2), 109-116.January 1981
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The structure and physiology of abdominal proprioceptors in larval dragonflies (Anisoptera) Article
Odonatologica, 10(2), 117-130.January 1981
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On a dragonfly collection from Syria Article
Odonatologica, 10(2), 131-145.January 1981
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Nederlandse Ornithologische Unie; Jaarverslag over 1980 Article
Limosa, 54(1), 33-34.January 1981
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Publikaties Article
DUIN, 4(2), 15-16.January 1981
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Abonnement 1982 Article
DUIN, 4(4), 2-2.January 1981