Unger,Irwin. <br/><br/>
These united states :  the questions of our past. 

 - 4th  ed. 
 - Englewood :  Prentice Hall,  1989. 
 - 480  p. :  ill ;    cm. 
<br/><br/>index. 
<br/><br/><label>ISBN: </label>013942038 :  $ 
<br/><br/><label>Subjects--Topical Terms: </label><br/>American history.