(NoHRANA PRIRODY (B:s (Nu^EBNOE POSOBIE (B/s - (NaSTANIN(B, (NlEW pETROWI^s; (NbLAGOSKLONOW(B, (NkONSTANTIN nIKOLAEWI^s ((NmOSKWA (B:s (NkOLOS(B,s, 1978)
(NuKAZ(B. (NLIT(B.: (NS(B. 235-236s
Keywords: (N|KOLOGIQs; (NoHRANA OKRUVA@]EJ SREDYs