The Trachtenberg speed system of basic mathematics. Translated and adapted by Ann Cutler and Rudolph McShane. Cutler, Ann. McShane, Rudolph Matas, joint author. Trachtenberg, Jakow, 1888-1953. Arithmetic. QA115 .C99 510.2 19 CUT Garden City, N.Y., Doubleday, 1960. 1960. 1960 Text 270 p. eng eng und