000 00260nam a2200109Ia 4500
008 211126s9999 xx 000 0 und d
100 _aDUGGAL K N
245 0 _aELEMENTS OF ENVIRONMENTAL ENGINEERING
260 _bS CHAND
365 _b360.00
942 _cBTECH
999 _c176514
_d176514