of the National Status and Trends Pro- 

 gram provided invaluable assistance and 

 advice. Bernard W. Gottholm created 

 the graphics in this report using soft- 

 ware and geographic data developed by 

 the Strategic Assessment Branch of the 

 Ocean Assessments Division, NOAA 

 Office of Oceanography and Marine 

 Assessment. Nathalie J. Valette-Silver 

 provided data from her collection of 

 contaminant chronologies in sediment 

 cores. Alan J. Mearns and his col- 

 leagues in the Historical Assessment 

 Group furnished data from various 

 sources required to construct a chronol- 

 ogy of tPCB in mussel tissues. Pamela 

 H. Rubin and Kevin D. McMahon pro- 

 vided editorial support. 



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