Tests of strength of roof supports used in anthracite mines of Pennsylvania / [by George S. Rice]
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Other title: | Report of the United States Bureau of Mines to the Pennsylvania State Anthracite Mine Cave Commission. Compressive strength of anthracite, bituminous coals and mine supports. |
Format: | Government Document Book |
Language: | English |
Published: |
Washington :
Dept. of Commerce, Bureau of Mines : Govt. Print. Off. [distributed],
1929.
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Series: | Bulletin (United States. Bureau of Mines) ;
303. |
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