Olen, Harvey <br/><br/>
Rotating disc biological treatment of acid mine drainage / 
by Harvey Olen and Richard F. Unz 
 - Washington, D.C. :  U.S. Government Printing Office,  1980 
 - xv, 115 p. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acid mine drainage<br/>Water--Purification
<br/><br/><label>Dewey Class. No.: </label>628.1683