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Flexible roof drill for low coal. Volume 2.
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, Contract H0242027, 1971 Jan; :1-78
CP; Final Contract Report
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, Contract H0242027
Washington State University
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division