Brueckner, Leo J. The new discovering numbers / Leo J. Brueckner, Elda L. Merton and Foster E. Grossnickle. - Philadelphia : John C. Winston, c 1956. - 346 p. : ill. ; 24 cm. - Winston arithmatics . Including index. 314 314 Subjects--Topical Terms: Arithmetic.Arithmetic -- Study and teaching. Dewey Class. No.: 511 / B832n