Rocket Propellant Handbook By Boris Kit and Douglas S. Evered. Pp. xiv + 354. (New York and London: The Macmillan Company, New York, 1960.) 12.50 dollars; 87s. 6d. Liquid Propellant Rockets By David Altman, James M. Carter, S. S. Penner and Martin Summerfield. (Prineeton Aeronautical Paperbacks, No. 1.) Pp. v + 189. (Prineeton, N.J.: Princeton University Press; London: Oxford University Press, 1960.) 2.95 dollars; 24s. net. Solid Propellant Rockets By Clayton Huggett, C. E. Bartley and Mark M. Mills. (Princeton Aeronautical Paperbacks, No. 2.) Pp. v + 167. (Princeton, N.J.: Prineeton University Press; London: Oxford University Press, 1960.) 2.45 dollars; 20s. net. Solid Propellant Rocket Research A Selection of Technical Papers based mainly on a Symposium of the American Rocket Society, held at Princeton University, Princeton, January 28, 29, 1960. Edited by Martin Summerfield (Progress in Astronautics and Rocketry, Vol. 1.) Pp. xix + 692. (New York: Academic Press, Inc.; London: Academic Press, Inc. (London), Ltd., 1960.) 6.50 dollars.