Blocksom, K.A., E. Emery, and J. Thomas. 2006. Comparison of random and systematic site selection for assessing attainment of aquatic life uses in segments of the Ohio River. EPA 600/R-06/089. U.S. Environmental Protection Agency, National Exposure Research Laboratory, Cincinnati, Ohio.

Blocksom, K.A., E. Emery, and J. Thomas. 2006. Comparison of random and systematic site selection for assessing attainment of aquatic life uses in segments of the Ohio River. EPA 600/R-06/089. U.S. Environmental Protection Agency, National Exposure Research Laboratory, Cincinnati, Ohio.

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