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

Author: Paul, J. W.
Additional Authors: Tomlinson, H.
Year: 1929
Document Type: MAIN
SUDOC: C 22.11:6151
Series: Information circular / Bureau of Mines ;
Report Number: 6151
Subjects: Coal mines and mining--Pennsylvania--Westmoreland County
Coal mines and mining--Pennsylvania--Armstrong County
Link: https://hdl.handle.net/2027/mdp.39015095078534

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