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Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples; T-153 (trace constituents), M-146 (major constituents), N-57 (nutrient constituents), N-58 (nutrient constituents), P-30 (low ionic strength constituents), GWT-3 (ground-water trace constituents), GWM-3 (ground-water major constituents) and Hg-26 (mercury) distributed in April 1998

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