Environment and change :   the next fifty years / 
Edited by WIlliam R. Ewald. 
 - London :  Indiana university press,  1968. 
 - 392 p. :  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental science
<br/><br/><label>Dewey Class. No.: </label>303.4  / EWE 1968