UNESCO <br/><br/>
Teaching aids in hydrology 

 -  1972 
 - 64p.  cm. 
<br/><br/><label>Standard No.: </label>49575 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>External dynamic
<br/><br/><label>Dewey Class. No.: </label>H422, L23-;1