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E-book
Horizontal trajectories of rotary-drilled holes
- Publisher:
- [Pittsburgh, Pa.?] : U.S. Dept. of the Interior, Bureau of Mines, [1988]
- Phys. Desc.:
- 11 pages : digital, PDF file
- Electronic resource
- Click for online content.
E-book
Comparisons between cross-measure boreholes and surface gob holes
- Publisher:
- [Pittsburg, Pa.?] : U.S. Dept. of the Interior, Bureau of Mines, [1986]
- Phys. Desc.:
- 14 pages : digital, PDF file
- Electronic resource
- Click for online content.
E-book
Degasification study from an air shaft in the Beckley coalbed
- Publisher:
- [Pittsburgh, Pa.?] : U.S. Dept. of the Interior, Bureau of Mines, [1982]
- Phys. Desc.:
- 19 pages : digital, PDF file
- Electronic resource
- Click for online content.
