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Methods and costs of sinking a shaft through a fractured, water-bearing formation at Friedensville, Pa.

Published Year

• 1950-1959 (1) *

Subject

• Prospecting--Pennsylvania--Lehigh County (1)
• Shaft sinking (1)
• Shaft sinking--Costs (1)
• Zinc ores--Pennsylvania--Lehigh County (1) *

Author

• Hastings, Warren. (1)
• Kane, F. J. (1)
• Wright, Fred D. (1) *

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