Purdom P Walton  1917 <br/><br/>
Environmental health / 
edited by P. Walton Purdom. 
 - New York :  Academic Press,  1971. 
 - xvi, 584 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental health
<br/><br/><label>LC Class. No.: </label>WA30  
<br/><br/><label>Dewey Class. No.: </label>614.7