Blumenthal, I. S. <br/><br/>
Positive pollution / 
I. S. Blumenthal 
 - California :  Rand Corporation,  1971 
 - iv, 31 pages ;  28 cm. 
 - The Rand paper series ;  p.4613 .
 - Rand paper series ;  p.4613 .
<br/><br/>Includes bibliographical references.