FILE - In this July 16, 2009, file photo, Oklahoma Attorney General Drew Edmondson stands by the Illinois river in Tahlequah, Okla., when he sued 12 Arkansas poultry companies for polluting the Illinois River watershed. Conservation groups are expressing disappointment with an agreement between Oklahoma and Arkansas officials to study ways to improve water quality in the Illinois River watershed. The groups say the agreement fails to control pollution of the river in Oklahoma and merely calls for another study of the river's basin. (AP Photo/Brandi Simons, File)
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