International trade theory and regional income differences;  United States 1880-1950, 
by Erling Olsen.  
 - Amsterdam,  North-Holland Pub. Co.  1971.  
 - xv, 221 p. with illus  23 cm. 
<br/><br/> Summary in Dutch.  
<br/><br/><label>ISBN: </label>0720431700 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Income--Mathematical models.<br/>Income--Mathematical models.--United States<br/>International trade--Mathematical models.
<br/><br/><label>LC Class. No.: </label>HC79.I5  / O5