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Keywords: (NtEHNIKA(B. (NtEHNI^ESKIE NAUKI s; (NgORNOE DELOs; (NmARK[EJDERSKOE DELOs; (NmESTOROVDENIQ POLEZNYH ISKOPAEMYH (B- (NiNVENERNO(B-(NGEOLOGI^ESKIE ISSLEDOWANIQs