000 00313nam a2200133Ia 4500
008 220901s2012 xx 000 0 eng d
082 _a628 RAO
100 _aRao; Venugopala
245 0 _aPrinciples of environmental sciene and eng.
250 _a6
260 _bPHI
_c2012
_aDelhi
300 _a276
942 _2ddc
_cBK
999 _c22
_d22