Ehrlich, Paul R. <br/><br/>Population resources environment :  issues in human ecology / Paul R. Ehrlich   -- San Francisco  W.H Freeman  1970 <br/>383 p.  26 cm. <br/><br/> Includes bibliographical references and index. <br/><br/><label>ISBN: </label>0716706806 <br/><br/><label>Subjects--Topical Terms: </label><br/>Human ecology. <br/><br/><label>Dewey Class. No.: </label>GC 304.2 Eh89 1990