(NiTOGI OB_EDINENNOGO PLENUMA ck I ckk wkp(B((NB(B) :s 17-21 (NDEK(B. 1930 (NG(B. /s ((NlENINGRAD (B:s (NoGIZ(B-(NpRIBOJ(B,s, 1930)
Keywords: (Nkps