Development of poly phenylene oxide membranes / 
United States, Department of Interior 
 - Washington, D.C. :  The Department,  1971 
 - 65 p. ;  26 cm. 
<br/><br/> Report no. 697 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Purification--Reverse osmosis process<br/>Acid mine drainage<br/>Manufacturing wastes--Prevention
<br/><br/><label>Dewey Class. No.: </label>628.1683