Fogel, Robert William. <br/><br/>
Tiempo en la cruz : la economía esclavista en los Estados Unidos 

 - México  Siglo Ventiuno  1981. 
 - 267 p.  ill.  20 cm. 
<br/><br/> Reprint. Originally published: Boston, Mass. : Little, Brown, c1974. 
<br/><br/>Includes bibliographical references (p. [274]-279) and index. 
<br/><br/><label>ISBN: </label>0393306208  8.95 (11.95 Can.) 
<br/><br/><label>LCCN: </label>89035275 //r90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Slavery--Economic aspects--United States.
<br/><br/><label>LC Class. No.: </label>E449  / .F65 1989