Travis, William Penfield. <br/><br/>
The theory of trade and protection / 
William Penfield Travis. 
 - Cambridge :  Harvard Univ.,  c1964. 
 - x, 296 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commercial policy.<br/>International economic relations.<br/>Protection and free trade.
<br/><br/><label>LC Class. No.: </label>HF 1713  / .T73