Mining and crushing methods and costs at the West Penn Limestone Mine of the West Penn Cement Co., West Winfield, Pa. / by George A. Morrison.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of Commerce, Bureau of Mines,
1931.
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| Series: | Information circular (United States. Bureau of Mines) ;
6446. |
| Subjects: |