TY  - BOOK
AU  - Fogel,Robert William
AU  - Engerman,Stanley L.
TI  - Time on the cross: evidence and methods, a supplement 
PY  - 1974///
CY  - Boston
PB  - Little, Brown
KW  - Slavery
KW  - Economic aspects
KW  - United States
N1  - Includes bibliography
ER  -