Houston, James D. <br/><br/>
Continental Drift 
James D. Houston 
 - New York  Mcgraw-hill book company   1978 
 - vii, 337 pages:  illustrations  21cm. 
<br/><br/> The theory that Earth's continents were once joined as a single supercontinent named Pangaea before breaking apart 200–250 million years ago and moving to their present positions. 
<br/><br/><br/>English  
<br/><br/><label>ISBN: </label>0070304882 
<br/><br/><label>Dewey Class. No.: </label>