Effectiveness of bleeder entries in ventilating pillared areas of bituminous-coal mines / by D.S. Kingery and D.D. Dornenburg.
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| Other title: | Bleeder entries. |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of the Interior, Bureau of Mines,
1957.
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| Series: | Report of investigations (United States. Bureau of Mines) ;
5360. |
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| Physical Description: | 24 pages : illustrations ; 27 cm. |
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