Inventory of main standards and parameters of the E waterway network "Blue Book" / 
United Nations Economic Commission for Europe (UNECE). 
 - Third revised edition 
 - New York ;  Geneva :  United Nations,  2017. 
 - 107 p. :  charts, maps ;  30 cm. 
 - 656.6 (4) (NLA) .
<br/><br/><label>ISBN: </label>9789211171334 
<br/><br/><label>Universal Decimal Class. No.: </label>656.6 (4) (NLA)