000 00355nam a2200157Ia 4500
008 131111s9999 xx 000 0 und d
020 _a81-7041-632-9
100 _aYadav,M.S
245 _aTeaching of science
260 _aNewDelhi
260 _bAnmol
260 _c1992
300 _a240p.
650 _aTeaching
_aScienceEducation
763 _a19464
999 _c30954
_d30954