000 00283nam a2200109Ia 4500
008 211214s9999 xx 000 0 und d
100 _aSiddiqui, N. N. and Siddiqui, M. N.
245 _aTeaching of Science: Today and Tomarrow
260 _bDoaba
_c2009
300 _a754
942 _cBK
999 _c52666
_d52666