A different frontier :  selected readings in the foundations of American economic expansion / 
edited by Lloyd C. Gardner. 
 - Chicago :  Quadrangle Books,  1966. 
 - 190  p. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Economic conditions.
<br/><br/><label>LC Class. No.: </label>HC 105.7  / .G37