Operating regulations to govern methods of mining oil shale, phosphate, sodium, and potash, and safety and welfare of employees in connection therewith, under Acts approved Feb. 25, 1920 (41 Stat. 437) and Oct. 2, 1917 (40 Stat. 297).

Bibliographic Details
Corporate Author:	United States. Bureau of Mines
Format:	Government Document eBook
Language:	English
Published:	Washington : U.S. GPO, 1922.
Subjects:	United States. > Bureau of Mines. Mine accidents. Oil-shale industry. Phosphate industry. Electronic books.
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