Author: Clarke, J.M., 1894.:
Title: The Lower Silurian Cephalopoda of Minnesota. [Exctracted from:] Geological and Natural History Survey of Minnesota. Volume III. Paleontology. Chapter IX.
Description: [Minneapolis.] 4to. Pp. 761-812,[28], numerous figs. on 14 pls., 9 figs. in text, notes & refs. Orig. wrs. Front cover a bit dustmarked, spine neatly mended, contents good.

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