^EPA 



United States 

 Environmental Protection 

 Agency 



Environmental Research 



Laboratory 



Duluth MN 55804 



EPA-600/9-80-034 

 July 1980 



V 



Research and Development 



Proceedings of the 

 Third USA-USSR 

 Symposium on the 

 Effects of Pollutants 

 Upon Aquatic 

 Ecosystems 



PB 80-2246S7 



W H 1 

 DOCUMENT 



CCH-LECT10''i 



