Population in a seasonal environment  / 
Stephen D. Fretwell 
 - New Jersey :  Princeton university,  1972 
 - 217 p.:  ill.; 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0691081050 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environment 
<br/><br/><label>LC Class. No.: </label>QL752 .F73 1972