000 00344nam a2200145Ia 4500
008 230915s9999 xx 000 0 und d
082 _a530 AST
100 _aAsthana, D.K
245 2 _aA Textbook Of Environmental Studies
260 _aNEW DELHI
260 _bS.CHAND
260 _c2007
300 _a460
650 _aEnvironmental Science
999 _c159026
_d159026