Bergmann, Ludwig. <br/><br/>
Ultrasonics : 

 - London :  G Bell and Sons,  1938. 
 - viii, 264 p. :  ill. ;  21 cm. 
<br/><br/>Includes bibliographic references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ultrasonics<br/>Ultrasonic technology<br/>Acoustic engineering
<br/><br/><label>Dewey Class. No.: </label>534.55  / BER