Sutton, Ann <br/><br/>
The wilderness world of the grand canyon :  "leave it as it is" / 
Ann Sutton; Myron Sutton; Photographs by Philip Hyde. 
 - Philadelphia :  Lippincott,  1971. 
 - 241 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography. Local history