Proceedings, Fourth International Conference on Acid Rock Drainage, Vancouver, B.C., Canada, May 31-June 6, 1997 
International Conference on Acid Rock Drainage 
 - Vancouver  [s.n.]  1997 
<br/><br/><label>Subjects--Index Terms: </label>DRENAJE ACIDO DE MINAS 
<br/><br/><label>Universal Decimal Class. No.: </label>622