Scope and Contents Contains materials pertaining to Supreme Court Cases State of Arkansas v. State of Oklahoma (No. 90-1262) and Environmental Protection Agency (EPA) v. State of Oklahoma (No. 90-1266). Also includes Synar's filing of an amicus curiae brief in support of the respondents. The cases involve the EPA's decision to permit the State of Arkansas to dump effluent in the Illinois River. These materials appear to have been handled by staffer Jarilyn Dupont.