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Hall, James; 1811-1898 / Geological survey of Wisconsin, 1859-1863. Palaeontology. Part third
(1871)
Plate XIIa, pp. [unnumbered]-Pl. 12 a
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Page Pl. 12 a
State Nui. Mat, Riot. 20. (CYSTIDEA.) 2 4 5 3 11 8 PI. 12 a (I
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