Barker M. Charles The "new" math : for teachers and parents of elementary school children / Charles M. Barker, Helen Curran, Mary Metcalf - 5a ed. - New York : The new american library, 1965. - 128 p. : ěl. ; 18 cm. - A signet book complete & unabridged . Incluye apčndice e ěndice Subjects--Topical Terms: Matematicas--Estudio y enseńanza LC Class. No.: QA135.5 / B37 1965