000 00275nam a2200121Ia 4500
008 220821s2006 xx 000 0 eng d
100 _aSINGH, DR. Y. K.
245 0 _aENVIRONMENTAL SCIENCE
250 _a1ST
260 _bNEW AGE
_c2006
300 _a309
942 _2ddc
_cBTECH
_03
999 _c590
_d590