Acknowledgments
A large number of individuals are responsible for the collection and chemical analysis of the samples reported here. These include workers at USGS State Water Science Centers responsible for specific collections made in USGS NAWQA study units within respective States and workers at the National Water Quality Laboratory who prepared and analyzed the samples. In addition, cooperating partners from numerous private, State, and Federal agencies were instrumental in assisting with collecting the fish. Robert M. Goldstein, Christopher J. Schmitt, Cathy Tate, and Dennis A. Wentz provided helpful reviews of the manuscript.
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