PREFACE TO VOLUME I 



This volume contains nineteen of twenty papers presented at the First 

 US-USSR Symposium on the Effects of Pollutants on Aquatic Ecosystems. All 

 papers, ten from each side, were given in English or Russian at Duluth, 

 Minnesota, USA between October 21 and 23, 1975, at the Environmental Re- 

 search Laboratory-Duluth of the U.S. Environmental Protection Agency. 



The three-day symposium climaxed a two-week visit by the Soviets as 

 part of a working group on "Effects of Pollutants on Aquatic Ecosystems 

 and Allowable Levels of Pollution". This is one of 40 working groups 

 established in a five-year international "Agreement on Cooperation in the 

 Field of Environmental Protection Between the United States of America 

 and the Union of Soviet Socialist Republics", signed May 23, 1972 at the 

 Moscow Summit Meeting. 



During their two-week visit, Dr. Donald I. Mount, Director of the 

 Duluth Laboratory and the U.S. Project Leader of the Working Group, 

 brought the six visiting Soviet scientists to water pollution research 

 laboratories in Cincinnati (Ohio), Columbia (Missouri), and Chicago 

 (Illinois), as well as Duluth (Minnesota), to observe the American faci- 

 lities and exchange technologies with U.S. researchers. 



At the end of the symposium, Dr. Mount and Professor Nikolay V. 

 Butorin, Soviet Project Leader of the Working Group, signed an agreement 

 outlining future activities of the group, including a reciprocal visit by 

 American scientists to the USSR in June 1976. Both countries pledged 

 their continued commitment to cooperative environmental activities. 



The publication of these proceedings is in accordance with that agree- 

 ment signed October 23, 1975 by Dr. Donald I. Mount and Professor Nikolay 

 V. Butorin. 



