Chemistry / by Royal B. Leach and Galen W. Ewing. Prepared under the direction of Educational Science Division, U.S. Industries, inc. Leach, Royal B. Ewing, Galen Wood, 1914- joint author. U.S. Industries, inc. Educational Science Division. Chemistry Programmed instruction. QD42 .L37 540 LET Includes index. Garden City, New York : Doubleday, 1966. 1966. 1966 Text v, 400 p. : eng A Tutor text