Resource-saving technology of selective mining with gob backfilling
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V Byzylo | O Koshka | S Poymanov | D Malashkevych | D. Malashkevych | V. Byzylo | O. Koshka | S. Poymanov
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V Byzylo | O Koshka | S Poymanov | D Malashkevych | D. Malashkevych | V. Byzylo | O. Koshka | S. Poymanov