000 00249nam a2200097Ia 4500
008 230915s9999 xx 000 0 und d
050 _aTD 153 .D84 2012
100 _aDR. DUGGAL K. N.
245 0 _aELEMENTS OF ENVIRONMENTAL ENGINEERING
942 _cBK
999 _c203620
_d203620