Olsen, Erling Heymann <br/><br/>
International trade theory and regional income differences: United States 1880-1950 

 - Amsterdam  North-Holland Publishing Company  1971 
 - xv,221p.  23cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Income
<br/><br/><label>LC Class. No.: </label>HC79.I5O5