A quarter century of mechanized mining:
notes on permissibility /
by L. C. Ilsley.

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Main Author: Ilsley, L. C.
Related Names: United States. Bureau of Mines.
Language(s): English
Published: Washington, D.C. : U.S. Dept of the Interior, Bureau of Mines, 1941.
Subjects: Mines and mineral resources.
Note: "March 1942".
Physical Description: 2 p. : ill. 27 cm.
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