(NwOPROSY UPRAWLENIQ PRIRODOJ (B/s - (NnESTEROW(B, (NwALENTIN gRIGORXEWI^s; (NaTROHIN(B, (Nw(B.(Ng(B.s ((NmOSKWA (B:s (NlESNAQ PROMY[LENNOSTX(B,s, 1981)
Keywords: (NoHRANA OKRUVA@]EJ SREDYs