Willis, Bailey. <br/><br/>
Outlines of geologic history, with special reference to North America 

 - Chicago :  University,  1910 
 - 306 p.  : ilus. 
<br/><br/><label>LCCN: </label>54866 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología.
<br/><br/><label>Dewey Class. No.: </label>551.7  / W55