The Tri-State district includes the Superfund site in what Oklahoma cities?
Tri-State district:  The tri-state district includes three mining-related Superfund sites: the Tar Creek Superfund site in Oklahoma, and two others in Missouri and Kansas. Tar Creek Superfund site: Tar Creek Superfund site is a United States Superfund site, declared 1983, located in the cities of Picher and Cardin, Northeastern Oklahoma.
i don't know