WORLD Health Organization <br/><br/>
Epidemiology, etiology, and prevention of periodontal diseases 

 - Geneva  WHO  1978 
 - 60 p.- 
 - WHO Technical report series 621 .
<br/><br/> Includes reference.<br/> 
<br/><br/><label>ISBN: </label>9241206217 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Periodontics<br/> Dentistry <br/> WHO Technical report series 621
<br/><br/><label>Dewey Class. No.: </label>617.632  / WOR