Trends in the American economyin the nineteenth ce 

 - National Bureau of Economic Research, Studies in income and Wealth 24 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>United States Economic Conditions
<br/><br/><label>Dewey Class. No.: </label>X.73.M9, K0