000 00325nam a2200109Ia 4500
008 220421s1991 xx 000 0 und d
041 _aeng
082 _a500.207
_bGUP/TEA
100 _aGupta sharwan Kumar
_9570439
245 _aTeacing physical science in secondary school
260 _aIndia
_b Harper collins publishers
_c1991
999 _c396547
_d396547