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Displaying 1-4 of 4 results for author "Chekan, G. J. (Gregory J.)"
Effects of abandoned multiple seam workings on a longwall in Virginia / by Gregory J. Chekan, Rudy J. Matetic, and David L. Dwyer.
- Text
- [Washington, D.C. (2401 E St., NW, MS #9800, Washington, 20241) : U.S. Dept. of the Interior, Bureau of Mines, 1989]
- 1989
Analysis and design considerations for superimposed longwall gate roads [microform] / by Gregory J. Chekan and Jeffrey M. Listak.
- Text
- Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1992.
- 1992
Interactions between multiple seam longwall and room-and-pillar operations : a case study in Boone County, WV / by Gregory J. Chekan and Rudy J. Matetic.
- Text
- Washington, D.C. (2401 E St., N.W., MS #9800, Washington 20241) : U.S. Dept. of the Interior, Bureau of Mines, 1990.
- 1990
Design practices for multiple-seam longwall mines [microform] / by Gregory J. Chekan and Jeffrey M. Listak.
- Text
- Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1993.
- 1993
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