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|All Authors / Contributors:||
Frederick C Mills
|Notes:||Reprint of the ed. published by National Bureau of Economic Research, New York, which was issued as no. 2 of the Bureau's Twenty-fifth anniversary series.
|Description:||xii, 140 pages : illustrations ; 24 cm.|
|Series Title:||National Bureau of Economic Research publications in reprint.; Twenty-fifth anniversary series, 2.|
|Responsibility:||Frederick C. Mills.|