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Machinery Involved In Quarrying Of Granite

Mining and Quarrying U S Geological Survey Mining and Quarrying Trends US Geological Survey The Problem of Dust Phthisis in the Granitestone Industry by Frederick Ludwig Haffman published by Government Printing Office 1922 178 ppPrevious investigations into the dust hazard of certain trades issued as Bulletins nos 79 82 and 231 of the US Bureau of labor statistics This

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