000 00266nam a2200109Ia 4500
008 231219s1989 xx 000 0 und d
041 _aeng
100 _aN.BHANDULA
245 _aTEACHING OF SCIENCE
260 _aLANDON
_bPRAKASH BROS LUDHIANA
_c1989
300 _a342p
999 _c344391
_d344391