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The top documents tagged [coal pillars]
HIGH CONCENTRATION FILL TECHNOLOGY – A NEW AREA ON ASH UTILIZATION By Dr. C. N. Ghosh, Chief Scientist Central institute of mining & fuel research ( Council
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Summary of Proposed Conceptual Changes (with brief justifications) Office of Oil and Gas Management (OOGM) Title 25 Pa. Code Chapter 78 Subchapter D. Well
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Design Optimization of Longwall Chain Pillars
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