Leff S <br/><br/>
Social medicine 
by Leff S 
 -  1953 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>69923 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Public health
<br/><br/><label>Dewey Class. No.: </label>L:5, J3