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Displaying 1-3 of 3 results for author "Unger, Richard L."
Reducing back injuries in low-coal mines : redesign of materials-handling tasks / by Sean Gallagher, Thomas G. Bobick, and Richard L. Unger.
- Text
- Washington, D.C. (2401 E St., N.W., MS #9800, Washington 20241) : U.S. Dept. of the Interior, Bureau of Mines, 1990.
- 1990
Material handling devices for underground mines / by Ernest J. Conway and Richard L. Unger.
- Text
- Pittsburgh, PA : U.S. Dept. of the Interior, Bureau of Mines, 1989.
- 1989
Maintainability design of underground mining equipment [microform].
- Text
- [Pittsburgh, Pa.] : Bureau of Mines, U.S. Dept. of the Interior ; [Springfield, Va. : National Technical Information Service, distributor, 1988-1989]
- 1988-1989
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