511.07 W Wilson, Guy Mitchell, 1876- Teaching the new arithmetic; what to teach, how to teach it, provisions for professional growth, by Guy M. Wilson... Mildred B. Stone. . . and charles 0. Dalrymple... lst. ed. New York and London, McGraw-Hill book company, inc., 1939. xi, 458 p. illus., diagrs. 23 cm. (Half- title: McGraw-Hill series in education, Harold Benjamin, consulting editor) Bibliography: p. 417-440.