x  x <br/><br/>
Man natural environment ;  a systems approach. 

 - x 
 - Massachusetts  x  1974 
 - viii, 334p 
<br/><br/>
<br/><br/><label>ISBN: </label>x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology Environment 
<br/><br/><label>Dewey Class. No.: </label>574.5/MAN