International trade statistics concepts and definitions. 

 - New York  United Nations          1982 
 - ii,71p.  cm. 
<br/><br/> Statistical papers series M., no. 52/ Rev. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X:54s.1.N82, M2/UN