Understanding the earth :  a reader in the earth sciences / 
edited by I. G. Gass, Peter J. Smith and R. C. L. Wilson. 
 - 2nd ed. 
 - Sussex :  Artemis Press for the Open University and the English Language Book Society,  1972. 
 - 383 p. :  ill. 
<br/><br/> "An Open University book." 
<br/><br/><label>ISBN: </label>0851413080 
<br/><br/><label>LCCN: </label>91026142 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth sciences.