000 00259nam a2200109Ia 4500
008 211126s9999 xx 000 0 und d
100 _aDUGGAL KN
245 0 _aELEMENTS OF ENVIRONMENTAL ENGINEERING
260 _bS CHAND
365 _b360.00
942 _cBTECH
999 _c177432
_d177432