IRVING, R.D. - On the classification of the early Cambrian and pre-Cambrian formations. A brief discussion of principles, illustrated by examples drawhn mainly from the Lake Superior region.

1887. 7th Annual Report United States Geological Survey; pp. 365-454, 33 fig. 22 plts. h.t. incl. 2 col. maps. Orig. extract with plain new wrps. as such very good, sm4to.

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