000 00298nam a22001337a 4500
003 OSt
020 _a9788121915472
082 _a627 DUG
100 _aDuggal, K N
245 _aElements of Environmental Engineering
260 _aNew Delhi
_bS Chand & Co.
_c2014
300 _a451p.
942 _2ddc
_cBK
999 _c5084
_d5084