000 00269nam a2200121 4500
082 _a370
_bMAH.M
084 _2Colon Classification
100 _aMahen
245 _aMain trends of research /
_cby Mahen
260 _bUNESCO,
_c1970.
300 _a818p. :
942 _cBK
999 _c685637
_d685637