Levins, Richard. <br/><br/>
Evolution in changing environments:  some theoretical explorations / 
Richard Levins. 
 - Princeton, N. J. :  University Press,  1968. 
 - ix, 120 p. :  ill.;  23 cm. 
 - Monographs in population biology;  no. 2. .
<br/><br/>Includes bibliographical references (p. 113-116) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal populations.<br/>Population genetics.<br/>Evolution.<br/>Ecology.
<br/><br/><label>Dewey Class. No.: </label>591.5 LEV