Petersen, Morris S. <br/><br/>
Interpreting earth history :  a manual in historical geology / 
Morris S. Petersen, J. Keith Rigby. 
 - 3rd ed. 
 - Dubuque, IA :  W.C. Brown,   c1982. 
 - vii, 211 p. :  ill. ;   28 cm. 
<br/><br/><label>ISBN: </label>0697050637 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Historical geology-- Problems, exercises, etc.
<br/><br/><label>Dewey Class. No.: </label>551.7