concept

Time on the cross : the economics of American Negro slavery / by Robert William Fogel and Stanley L. Engerman.

Time on the cross : evidence and methods, a supplement / by Robert William Fogel and Stanley L. Engerman.

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Engerman, Stanley L.

Catalogue

Time on the cross : the economics of American Negro slavery / by Robert William Fogel and Stanley L. Engerman.

Time on the cross : evidence and methods, a supplement / by Robert William Fogel and Stanley L. Engerman.