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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

Published Year

• 1930-1939 (1)
• 1940-1949 (1)

Subject

• Coal mines and mining--Pennsylvania--Pittsburgh (2) *

Author

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

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