Threshold signals, edited by James L. Lawson [and] George E. Uhlenbeck [under the supervision of the] Office of Scientific Research and Development, National Defense Research Committee. Lawson, James Llewellyn, 1915- 1 st ed. Uhlenbeck, George Eugène, 1900-1988, joint ed. Radio Receivers and reception. Radio Interference. Perception. TK6553 .L39 537.127 LAT Bibliographical footnotes. New York, McGraw-Hill, 1950. 1950. 1950 Text xii, 388 p. eng