000 00370nam a2200145Ia 4500
008 230711s9999||||xx |||||||||||||| ||und||
041 _aENG
082 _a628
_bDU-E
100 _aDuggal K.N. 
245 0 _aElements of environmental engineering
250 _a6th . Ed.
260 _c2002
_aNew Delhi
_bS.Chand & Company Ltd
650 _aCivil Engineering
942 _cBK
999 _c4264
_d4264