Fogel, Robert William <br/><br/>
Time on the cross :  the economics at American negro slarery / 
by Robert William Fogel and Stanley L. Eengerman 
 - London :  W. W. Norton,  1989 
 - 306 p. :  charts,maps ;  20 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0393306208 :  USD 11.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Slavery--Economic aspects--United States
<br/><br/><label>Dewey Class. No.: </label>331.117340973