American standard acoustical terminology / Sponsor: Acoustical Society of America, in cooperation with the Institute of Radio Engineers, inc. Approved July 31, 1951. American Standards Association. Sound Dictionaries. QC225 .A55 534 ACA At head of title: ASA Z24.1-1951; revision of Z24.1-1942. New York : American Standards Association, c1951. c1951. 1951 Text 50 p. eng