Spencer, Edgar Winston <br/><br/>
The dynamics of the earth :  an introduction to physical geology / 
by Edgar Winston Spencer with drawings by Elizabeth Humphris Spencer 
 - New York :  T.Y. Crowell Co,  1972 
 - 649 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>069024844X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical geology