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METHOD OF MINING DEPOSITS OF USEFUL MINERALS
METHOD OF MINING DEPOSITS OF USEFUL MINERALS
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机译:有用矿物的矿床开采方法
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摘要
method of mining activities, including division of the deposits on the floors and подзтажи,: the floors and подэтажных drilling, подсечных and carriage ортных fallsthe lower part of the block кровлю t
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