Boyd, Mark Frederick. <br/><br/>
Preventive medicine /    
Mark frederick Boyd. 
 - 4th ed. reset. 
 - Philadelphia :   W.B. Saunders  ,   1932. 
 - 532 p. :    ill. ;    24 cm. 
<br/><br/>Includes bibliographies 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medicine, Preventive--------
<br/><br/><label>National Library of Medicine Call No.: </label>DVSO   /  B692p 1932.