000 00309nam a2200133Ia 4500
008 180612s9999||||xx |||||||||||||| ||und||
041 _aen
082 _a579.22
100 _aSHARMA,P.D.
245 0 _aEconogy and Environment
260 _aMeerut.
_bRastogic pub.
_c1999
300 _axvi,660p.,
942 _cPR
999 _c51048
_d51048