Modern elementary mathematics, by Morgan Ward and Clarence Ethel Hardgrove. Ward, Morgan, 1901-1963. Hardgrove, Clarence Ethel. Arithmetic Foundations. Geometry. QA248.3 .W3 511 WAM Includes bibliographies. Reading, Mass., Addison-Wesley Pub. Co. [1964] [1964] 1964 Text xii, 420 p. eng Addison-Wesley series in science and mathematics education