Park's k <br/><br/>
Text Book of Preventive and Social Medicine 

 - 17th 
 - JABALPUR  M/s Banarsidas Bhanot  2002 
 - 671 
<br/><br/><label>Subjects--Topical Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>617.601