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This photo shows the American Queen steamboat docked on the Mississippi River in Memphis, Tenn., Monday, Sept. 16, 2019, where a U.S. Geological Survey nutrient sensor was installed to measure nutrient levels and water quality along the Mississippi River. The data-gathering sensor attached to the steamboat will give scientists and cities a better understanding of water quality along the entire span of the Mississippi River, officials said Monday. (AP Photo/Adrian Sainz)

This photo shows the American Queen steamboat docked on the Mississippi River in Memphis, Tenn., Monday, Sept. 16, 2019, where a U.S. Geological Survey nutrient sensor was installed to measure nutrient levels and water quality along the Mississippi River. The data-gathering sensor attached to the steamboat will give scientists and cities a better understanding of water quality along the entire span of the Mississippi River, officials said Monday. (AP Photo/Adrian Sainz)

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