Spencer, Edgar Winston. <br/><br/>
Basic concepts of physical geology / 
With drawings by Elizabeth H umphris Spencer. 
 - New York :  Crowell ,  [c1962] 
 - 472 p. :  ill. ;  27 cm. 
<br/><br/>Includes bibliographical references  and index 
<br/><br/><label>LCCN: </label>62-007082 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical geology.
<br/><br/><label>Dewey Class. No.: </label>551.4