Acoustic measurement / Leo L. Beranek. Beranek, Leo L. (Leo Leroy), 1914- Sound Measurement. Electro-acoustics. QC227 .B4 621.38 BEA "Prepared under the auspices of the Office of Naval Research, Navy Dept., Washington, D.C." Bibliographical footnotes. New York : J. Wiley, c1949. c1949. 1949 Text vii, 914 p. : eng