000 00305nam a2200109Ia 4500
008 220510s1964 xx 000 0 und d
041 _aeng
082 _a507
_bRIC
100 _aRichardson,John S,
_9778083
245 _aScience Teaching in secondary schools
260 _aNew Jersey:
_bEnglewood Cliffs,
_c1964
999 _c528293
_d528293