Ojakangas Richard W <br/><br/>
Earth    Past and present    
Ojakangas Richard W; Darby David G 
 - New York  McGraw Hill U S A       1976 
 - x,260p.  cm. 
 - McGraw Hill Earth Science Paper Back Series .
<br/><br/><label>ISBN: </label>0070476764 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomorphology
<br/><br/><label>Dewey Class. No.: </label>U211, L6