(NtEHNI^ESKIE SREDSTWA RAZWEDKI MESTOROVDENIJ TWERDYH POLEZNYH ISKOPAEMYH (B:s (Nu^EBNOE POSOBIE (B/s - (NpROKOFXEW(B, (Na(B.(Np(B.s ((NmOSKWA (B:s (Nmgu(B,s, 1975)
Keywords: (NgEOLOGIQs