The Permanent frontier :  an illustrates history of the U.S. economy in action / 
by the staff of Institute of Economic Affairs, New York University ; Haig Babian, dir 
 - 120 páginas 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Estados Unidos--Condiciones económicas
<br/><br/><label>LC Class. No.: </label>HC103  / P47