O'Brien, Richard C. <br/><br/>
Dental radiography :  an introduction for dental hygienists and assistants /  [textbook] 
Richard C. O'Brien. 
 - Fourth edition / 
 - Philadelphia :  Saunders,  1982. 
 - ix, 296 pages :  illustrations ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0721668879 9780721668871 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teeth--Radiography.<br/>Radiography, Dental.
<br/><br/><label>LC Class. No.: </label>RK309  / OBR