Hansen, Wallace R.,  1920- <br/><br/>
The Black Canyon of the Gunnison,  today and yesterday, 
by Wallace R. Hansen. 
 - [Washington,  For Sale by the Superintendent of Documents, U. S. Govt. Print. Off.,  1965] 
 - vii, 76 p.  illus., maps.  24 cm. 
<br/><br/>Bibliography: p. 75-76. 
<br/><br/><label>LCCN: </label>gs 65000326  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Colorado--Black Canyon.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 1191