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Location of Study Areas for Triazine Herbicides in the Midwestern US

By Environmental Health Program 2005 (approx.)
Location of U.S. Geological Survey Toxic Substances Hydrology Program study areas for triazine herbicides in the Midwestern US
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Detailed Description

Location of U.S. Geological Survey Toxic Substances Hydrology Program study areas for triazine herbicides in the Midwestern United States

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Public Domain.