Author: | Blaylock, D. W. |
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Additional Authors: | Abernethy, R. F., Dowd, James J. |
Year: | 1956 |
Document Type: | N/A |
Series: | United States Bureau of Mines Reports |
Report Number: | R. I. 5231 |
Subject: | Coal -- Pennsylvania -- Clarion County. |
Link: | http://digital.library.unt.edu/ark:/67531/metadc38642/ |