000 00323nam a2200145Ia 4500
008 131111s9999 xx 000 0 und d
100 _aKhurana,Usha
245 _aParyavaran shiksha
260 _aNew Delhi
260 _bTaksh shila
260 _c1996
300 _a55p.
650 _aHindi
_aPollution
763 _a20471
999 _c43134
_d43134