How To Set Up A Crushed Rock Industry

How To Set Up A Crushed Rock Industry

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2015-6-21Mining and Quarrying, U. S. Geological Survey. Mining and Quarrying Trends, U.S. Geological Survey. The Problem of Dust Phthisis in the Granite-stone Industry, by Frederick Ludwig Haffman, published by Government Printing Office, 1922, 178 pp.Previous investigations into the dust hazard of certain trades issued as Bulletins nos. 79, 82, and 231 of the U.S. Bureau of labor.

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