1.
Proceedings, new technology for ground control in retreat mining [microform] / Christopher Mark and Robert J. Tuchman.
Mark, Christopher.; Tuchman, Robert J.; Pittsburgh Research Laboratory (National Ins[...]
[Atlanta, Ga.?] : U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1997.
HE 20.7130: 9446 |
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