Excerpt from The Nature of Ore Deposits, Vol. 1 of 2I am under deep obligation to Mr. Robert Stein, of the Bureau of Statis; tics, for his help in the translation, and to Mr. S. F. Emmons for his eriti cism and revision of a number of descriptions. The prefaces are given in the original German, that the charm and spirit of Professor Beck's text may be retained.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books.

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