000 00318nam a2200145Ia 4500
008 220421s9999||||xx |||||||||||||| ||und||
020 _c70
040 _aET
100 _aYADAV SIDDIQUI
245 0 _aTEACHING OF SCIENCE
260 _bARYA PUBLICATION
_aNEW DELHI
300 _a247
500 _a65902
942 _cBK
999 _c71865
_d71865