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Experiments on strength of small pillars of coal in the Pittsburgh bed

Progress report :experiments on strength of small pillars of coal in the Pittsburgh bed

Effect of changes in moisture and temperature on mine roof.

Published Year

• 1930-1939 (1)
• 1940-1949 (2)

Subject

• Coal mines and mining--Pennsylvania--Pittsburgh (3) *
• Mine roof control--Pennsylvania--Pittsburgh (1)

Author

• Greenwald, H. P. (3)
• Hartmann, Irving. (3) *
• Howarth, H. C. (2)

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