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Book Reviews : Study of the Control of Permeability of Nylon Parachute Cloth at High and Low Differential Pressures. Hamilton J. Bickford,Donald K. Kuehl,and Thomas L. Rusk,Jr.,U. S. Department of Com merce,Office of Technical Services,Washington,D. C.,Report No. PB 111855,1955. 46 pages. Price $1.50