000 00291nam a2200121Ia 4500
008 220901s2010 xx 000 0 eng d
082 _a628 RAO
100 _aRao, P.V.
245 0 _aPrinciples of environmental sciene and ans.
260 _bPHI
_c2010
_aDelhi
300 _a276
942 _2ddc
_cBK
999 _c220
_d220