(NoHRANA PRIRODY (B:s (Nu^EBNOE POSOBIE (B/s - (NbANNIKOW(B, (NaNDREJ gRIGORXEWI^s; (NbANNIKOW(B, (Na(B.(Ng(B.s; (NrUSTAMOW(B, (NaNWER kE@[EWI^s; (NwAKULIN(B, (NaLEKSANDR aLEKSEEWI^s ((NmOSKWA (B:s (NaGROPROMIZDAT(B,s, 1985)
Keywords: (NoHRANA OKRUVA@]EJ SREDYs