UNIT FOR VENTILATION OF DEEP QUARRIES von AVERIN BORIS A,SU, SMIRNOV GENNADIJ P,SU, BOROVSKIKH LEONID D,SU, SKACHKOV GEORGIJ I,SU, MALGIN OLEG N,SU, GEREGLYAD YURIJ M,SU, KONOREV MIKHAIL M,SU, CHERNITSKIJ ISAJ A,SU

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