Spencer, Edgar Humphris <br/><br/>
Basic concepts of historical geology 
Edgar Humphris Spencer 
 - New york:  Thomas Y Crowell,  1962. 
 - xvi, 504p 
<br/><br/> PB 
<br/><br/><br/>Eng 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic
<br/><br/><label>Dewey Class. No.: </label>551.7  / SPB