The international symposim on flow-through rock drains / 
Organized by technical and research committee on reclamation ; ed. Grant symons 
 - 206 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Flujo de agua subterránea--Congresos
<br/><br/><label>LC Class. No.: </label>GB1197.7  / I57