A Monograph of the Trilobites of North America: with Coloured Models of the Species — Asaphus Selenurus.[27] Eaton. Casts Nos. 14 & 15.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Asaphus Selenurus.[27] Eaton. Casts Nos. 14 & 15. · ch 27/57

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