International Conference on Acid Rock Drainage Fourth, Vancouver, May 31-June 6, 1997. Proceedings Volume IV 
International Conference on Acid Rock Drainage Fourth 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>DRENAJE ACIDO DE MINAS
<br/><br/><label>Universal Decimal Class. No.: </label>622.5