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proceedings of the united states national museum volume 76 article 9, paleontology

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Proceedings of the United States National Museum, Volume 76, Article 9, Plate 2

Proceedings of the United States National Museum, Volume 76, Article 9...

Proceedings of the United States National Museum, Volume 76, Article 9, Plate 2: Original description:' Middle and Lower Cambrian Crustacea / For explanation of plate see page 15