The natural resource content of United States foreign trade, 1870-1955.  

 - Cambridge,  M.I.T. Press  1963  
 - xvi, 142 p  illus  24 cm. 
<br/><br/>Bibliographical footnotes.  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Commerce.
<br/><br/><label>LC Class. No.: </label>HF3021  / .V2