000 00262nam a2200109Ia 4500
008 200701s2007 xx 000 0 eng d
100 _aDUGGAL. K.N
245 0 _aELEMENTS OF ENVIRONMENTAL ENGINEERING
260 _bS CHAND
_c2007
300 _a440
942 _2ddc
_cGE
999 _c2887
_d2887