(NpRIRODNYE RESURSY sEWERO(B-(NzAPADA(B, (NWOPROSY IH RACIONALXNOGO ISPOLXZOWANIQ I OHRANY (B:s (NsBORNIK NAU^NYH RABOT (B/s - (NkOWALEW(B, (Np(B. (Nm(B.s; (NlENINGRADSKIJ GOSUDARSTWENNYJ PEDAGOGI^ESKIJ IN(B-(NT IM(B. (Na(B.(Ni(B. (NgERCENAs ((NlENINGRAD (B:s (Nb(B. (NI(B.,s, 1975)
Keywords: (NzOOLOGIQ(B, (NBOTANIKA (B- (NiSSLEDOWANIQs