Lemon, Roy R. <br/><br/>
Principles of Stratigraphy 
/by Roy R. Lemon 
 - Toronto:  Merrill Publishing Company,  1990. 
<br/><br/><label>ISBN: </label>067520537901 
<br/><br/><label>Dewey Class. No.: </label>551.7  / LEM/P