Ratan, Vidya. <br/><br/>
A guide to preventive and social medicine / 
Vidya Ratan. 
 - 3rd ed. 
 - Delhi :   Jaypee Brothers,  c 1977. 
 - xiv, 272 p. :  ill. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>319   319 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Preventive Medicine.
<br/><br/><label>Dewey Class. No.: </label>614 / V688g