000 00249nam a2200109Ia 4500
008 160921s9999 xx 000 0 und d
100 _aKULSHRESHTA S.P.
245 _aTEACHING OF SCIENCE
260 _bR.LAL PUB.
_c2009
300 _a510
942 _cBK
999 _c31778
_d31778