Ecosystems, energy, population / 
Jonathan Turk ... [et al.]. 
 - Philadelphia :  Saunders,  1975. 
 - xi, 296 p. :  ill. ;  27 cm. 
 - Saunders golden series in environmental studies. .
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0721689302 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Human ecology.<br/>Ecolog�ia humana