Walker, Bryce S. <br/><br/>
The Great Divide / 
by Bryce S. Walker, and the editors of Time-Life Books. 
 - New York :  Time-Life Books,  1973. 
 - 184 p. :  illus. ;  27 cm. 
 - The American wilderness .
<br/><br/>Bibliography: p. 180. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural history--Rocky Mountains