Travis, William Penfield. <br/><br/>
The theory of trade and protection / 
William Penfield Travis. 
 - Cambridge :  Harvard University Press,  1964. 
 - x, 296 p. : 
<br/><br/><label>ISBN: </label>EXBLIB576 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protectionism.
<br/><br/><label>Dewey Class. No.: </label>382.71  / Th