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Mechanical Mining in Some Bituminous-coal Mines: Methods and equipment used in underground development. progress report 8
J. J. Shields
, J. J. Dowd
, W. A. Haley
· 1957
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Mechanical Mining in Some Bituminous-coal Mines: Progress Report
J. J. Shields
, J. J. Dowd
, W. A. Haley
· 1957
No image available
Mechanical Mining in Some Bituminous-coal /: Progress Report 8, Methods and Equipment Used in Underground Development.
J. J. Shields
· 1957
No image available
Mechanical Mining in Some Bituminous-coal Mines: Progress Report. Extraction of pillars with mechanized equipment
Wilbur A. Haley
· 1952
