Block, Irvin <br/><br/>
People / 
Irvin Block 
 - New York :  Madison Avenue,  1956 
 - 178p. :  ill. ;  20 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human ecology.<br/>Ecology.<br/>Environmental health.
<br/><br/><label>Dewey Class. No.: </label>304.2  / BLP 1956