Benson, Barbara Elna.  <br/><br/>
Music and sound systems in industry / 
Barbara Elna Benson. 
 - 1st ed. 
 - New York :  McGraw-Hill,  c 1945. 
 - xi, 124 p. :  ill. ;  22 cm. 
<br/><br/>54  54 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Applied physics.
<br/><br/><label>Dewey Class. No.: </label>621.384 / B443m