Standard international trade classification, Revised. 

 - New York  Statistical office of the United Nations.      1961 
 - vii; 135p.  cm. 
 - Statistical paper series M no.34 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>V1N45,93:3 (X:5).N61s, K1/UN