000 00341nam a2200133Ia 4500
008 220919s9999 xx 000 0 und d
082 _bDUG
100 _aDUGGAL, K.N.
245 0 _aELEMENTS OF ENVIRONMENTAL ENGINEERING
260 _bS.CHAND AND COMPANY PVT. LTD., NEW DELHI
_c2012
300 _a451
650 _aChemistry
942 _cBK
999 _c151276
_d151276