A Monograph of the Trilobites of North America: with Coloured Models of the Species — Isotelus Gigas. Dekay. Casts Nos. 21 and 22.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Isotelus Gigas. Dekay. Casts Nos. 21 and 22. · ch 38/57

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