Standard international trade classification VISION 

 - New  York United Nations USA      1986 
 - "Uniter Nations, statistical papers series M, No.34/Rev 3" .
<br/><br/><label>Standard No.: </label>27059 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Export
<br/><br/><label>Dewey Class. No.: </label>"X:54, M6/UN"