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Method and cost of mining the Upper and Lower Freeports and the Lower Kittanning coal in a group of mines in Western Central Pennsylvania

Published Year

• 1920-1929 (1)

Subject

• Coal mines and mining--Pennsylvania--Armstrong County (1) *
• Coal mines and mining--Pennsylvania--Westmoreland County (1)

Author

• Paul, J. W. (1) *
• Tomlinson, H. (1)

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