<<The>> economic Importance of the coal industry to Pennsylvania an investigation conducted under the auspices of the Coal Research Board of the Commonwealth of Pennsylvania
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Format: | UnknownFormat |
Published: |
University Park, Pa.
1967
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Series: | Special Research Report / Department of Mineral Ecoomics. College of Earth and Mineral Sciences. Pennsylvania State University
64 |
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Physical Description: | IX, 289 S. ; 4-o |
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