ISSN 0021 -8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION • VOLUME 24 NUMBER 3 MAY 1993 National Council oj Teachers qf lv!athen1atics The Journal for Research in Mathtmatics Education. an offictal JOUrnal of the Nauon.tl Coun"l of Teachers of M. themauuc, ''devoted to the mtere'" of teacher> of mothem•t"~ and math
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