Teaching aids in hydrology 

 - Paris :  UNESCO,  1972 
 - 64 p.  : ilus. ; gráfs. 
 - Technical papers in Hydrology  ; 11 .
 - Technical papers in Hydrology  ; 11 .
<br/><br/><label>LCCN: </label>46022 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hidrología--Estudio y enseñanza.