Fogel, Robert William,  <br/><br/>
Time on the cross  evidence and methods - a supplement 
/ by Robert William Fogel and Stanley L. Engerman. 
 - 1st edition 
 - Boston:  Little Brown & Co.,  1974. 
 - 2 volume :   illustrations ;   22 cm. 
<br/><br/>v.1 The economics of American Negro slavery.--v.2 Evidence and methods--a supplement. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Slavery--United States--Economic aspects.