000 00285nam a2200121Ia 4500
008 230303s9999 xx 000 0 und d
041 _aeng
082 _a577.14 CHA
100 _aChawla ( Shashi )
245 _aText book of Environmental studies
260 _aND
_bMGH
365 _cRS
999 _c185833
_d185833