Powis, Raymond L. <br/><br/>
A thinker's guide to ultrasonic imaging / 
Raymond L. Powis and Wendy J. Powis. 
 - Baltimore :  Urban & Schwarzenberg,  1984. 
 - 417 p. ;  26 cm. 
<br/><br/>Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diagnosis, Ultrasonic.