000 00280nam a2200109Ia 4500
008 211214s9999 xx 000 0 und d
100 _aSiddiqi, N. N. and Siddiqi, N.
245 _aTeaching of Science: Today and Tomarrow
260 _bDoaba
_c2009
300 _a754
942 _cBK
999 _c102030
_d102030