Our continent :  a natural history of North America 

 - Washington, D.C. :  National Geographic Society,  1976 
 - 398 p :  ill. (1 in pocket) ;  29 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0870441531  11.95 
<br/><br/><label>LCCN: </label>76-26633 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural history--North America