000 00273nam a2200109Ia 4500
008 220606s9999 xx 000 0 und d
100 _aSINGH B.B.
_911930
245 0 _aENVIRMENTAL SCIENCE
260 _bRAMESH PUBLICATION NEW DELHI
_c2013
300 _a296
942 _cBK
999 _c106812
_d106812