A Monograph of the Trilobites of North America: with Coloured Models of the Species — Asaphus Micrurus.[34] Cast No. 19. Fig. 3.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Asaphus Micrurus.[34] Cast No. 19. Fig. 3. · ch 32/57

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