Hydrologic information systems 

 - Paris :  UNESCO,  1972 
 - 72 p.  ; gráfs. 
 - Studies and reports in hydrology  ; 14 .
 - Studies and reports in hydrology  ; 14 .
<br/><br/><label>LCCN: </label>45872 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hidrología--Servicios de información.