Ehrlich, Paul R. <br/><br/>
Population, resources, environment  issues in human ecology 
by Paul R. Ehrlich and Anne H. Ehrlich. 
 - 2nd ed 
 - San Francisco  W. H. Freeman  1972. 
 - 383 p.: illus. ; 26 cm. 
<br/><br/> Third ed. published in 1977 under title: Ecoscience. 
<br/><br/>Bibliography: p. 360-363. 
<br/><br/><label>ISBN: </label>0716706954 
<br/><br/><label>LCCN: </label>07-16-706954 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Population<br/>Pollution<br/>Human ecology