Results of the maritime transport study for the year 1969-1972 

 - New York  United Nations Publication         1980 
 - v;391p  cm. 
 - Statistical papers series no. 2 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>V1N45,93(X4).N72<--N62s, M0/UN