Hearing aids and audiometers;  report. 

 - London,  H.M. Stationery Off.,  1947. 
 - iv, 71 p.  diagrs.  25 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>med48000923  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hearing aids.<br/>Audiometry.
<br/><br/><label>LC Class. No.: </label>RF300  / .M4 1947 
<br/><br/><label>Dewey Class. No.: </label>617.8078