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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
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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
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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.