A Monograph of the Trilobites of North America: with Coloured Models of the Species — Isotelus Stegops.[41] Green. Casts Nos. 26 and 27.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Isotelus Stegops.[41] Green. Casts Nos. 26 and 27. · ch 42/57

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