Report of the UNESCO/WMO/ICSU International Conference on Hydrology :   Towardsthe 21st century; research and operational needs. 

 - París :   Unesco,   1993. 
 - p.v.; 29cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrología<br/>Congresos
<br/><br/><label>Universal Decimal Class. No.: </label>556