Lack, David Lambert. <br/><br/>
Ecological isolation in birds / 
David Lack, main illustrations by Robert Gillmor. 
 - Oxford :  Blackwell,  1971. 
 - xi, 404 p. :  ill., maps. 
<br/><br/><label>ISBN: </label>0632068701 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bird populations.<br/>Isolating mechanisms.