JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 23 NUMBER 5 NOVEMBER 1992 LVational Cou neil qf Teachers o.f Mathe1natics The Journal for R~storth 1n Moth~maties Education. an offtctal JOurnal of the National Counctl of Teachers of \1athemattc•. •~ devoled to the tnlere~u of 1eacher. of mathemauc' and mathemauc< ~
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