Proceedings 

 - New  York United Nations U. S. A.    1971 
 - "vi, 101p."  cm. 
<br/><br/> "United Nations, Economic Commission for Europe, Publication" 
<br/><br/><label>Standard No.: </label>89011 
<br/><br/><label>Source: </label> Reports 
<br/><br/><label>Subjects--Topical Terms: </label><br/>River Industry
<br/><br/><label>Dewey Class. No.: </label>"X9(D268):8p1,N70, L1/UN"