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MARC view
Wagner, Sigrid, 1942- (Personal Name)
Her Modeling mathematical cognitive development, 1981: t.p. (Sigrid Wagner, Univ. of Georgia)
Research issues in the learning and teaching of algebra, c1989: t.p. (Sigrid Wagner)
Phone call to S. Wagner, 6-22-89 (Sigrid Wagner; b. 12-19-42; no middle name)