A Monograph of the Trilobites of North America: with Coloured Models of the Species — Calymene Bufo. Variety, Rana. Cast Nos. 11 & 12.

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A Monograph of the Trilobites of North America: with Coloured Models of the Species Calymene Bufo. Variety, Rana. Cast Nos. 11 & 12. · ch 25/57

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