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Authors whose works are in public domain in at least one jurisdiction

List of works by Robert L. Usinger

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Aquatic insects of California, with keys to North American genera and California species

Berkeley, University of California Press, 1956.
Classification of the Aradidae (Hemiptera-Heteroptera)

1959 book by Robert Leslie Usinger and Ryuichi Matsuda
Ṭuruq wa-usus ʻilm taṣnīf al-ḥayawān

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