00000cam a22000001a 4500 UP-1685675941123763845 Buklod 20071009080801.0 a r |||| 1| ta 710511s1971 nyua rb |001 0|eng d (iLib)UPTAC-00000006562 DLC UPVTC eng QA 135 S84 1971 Stern, Catherine 1894- Children discover arithmetic an introduction to structural arithmetic by Catherine Stern and Margaret B. Stern. Illus. by Phillis Borea. Foreword by W. W. Sawyer. Rev. and enl. ed. New York Harper & Row [1971] xv, 412 p. illus. (part col.) 22 cm. Bibliography: p. 401-404. Arithmetic Study and teaching. Stern, Margaret B. joint author. FO UPTAC UPTAC QA 135 S84 1971 Book