(NoBOROTNYE SREDSTWA UGOLXNOJ PROMY[LENNOSTI (B/s - (NsIGOW(B, (Ns(B.(Ng(B.s ((NmOSKWA (B:s (NuGLETEHIZDAT(B,s, 1954)
Keywords: (NkAMENNYE UGLI W CELOMs