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