New York, Toronto, London: McGraw-Hill Book Company, Inc. 1949. First Edition. xviii, 538 pages. 8vo. Publisher's original maroon cloth with black and gold labeling. Spine lightly sunned, a solid ex-library copy with two purple stamps noting "Surplus Duplicate" with a logo in the center we cannot distinguish, and staining from an old library pocket. Clean internally. Very Good. Cloth. 
Number 20 in the Rad Lab series. (Radiation Laboratory Series at MIT). Part of the Office of Scientific Research and Development, National Defense Research Committee.