Teaching aids in hydrology. 

 - Paris :  Unesco,  1972. 
 - 64 p. :  ill. 
 - Technical papers in hydrology ;  11 .
<br/><br/> At head of title: A contribution to the International Hydrological Decade. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrology--Study and teaching.