Petersen, Morris S. <br/><br/>
Interpreting earth history :  a manual in historical geology / 
Morris S. Petersen, J. Keith Rigby. 
 - 6th ed. 
 - Boston :  WCB McGraw-Hill,  1999. 
 - vii, 228 p. :  ill., maps (some col.) ;  28 cm. 
<br/><br/><label>ISBN: </label>0697282902 
<br/><br/><label>LCCN: </label>98-214486 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Historical geology--Problems, exercises, etc.