Robertson, A. E. <br/><br/>
Microphones / 
Arthur Edward Robertson 
 - 2nd ed. 
 - New York :  Hayden Book Co.,  c1963 
 - 357 p. :  ill. ;  21 cm 
<br/><br/> Includes Index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microphone
<br/><br/><label>Dewey Class. No.: </label>621.384133  / ROM 1963