Olsen, Erling,  1927- <br/><br/>
International trade theory and regional income differences :  United States 1880-1950 / 
by Erling Olsen. 
 - Amsterdam :  North-Holland Publishing Company,  1971. 
 - xv, 221 p. :  ill. ;  23 cm. 
 - Contributions to economic analysis ; 70 .
<br/><br/> Summary in Dutch. 
<br/><br/><label>ISBN: </label>0720431700 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Income--Mathematical models<br/>Income--United States--Mathematical models.<br/>International trade--Mathematical models.