Effects of Urbanization on Stream Ecosystems in the Willamette River Basin and Surrounding Area, Oregon and Washington

Scientific Investigations Report 2006–5101–D

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D

Figure - refer to figure caption for alternative text description

Figure 7. Pesticide concentrations and detection frequency for all stream samples, Willamette River basin and surrounding area, Oregon and Washington.
Number in parentheses is equal to the total detections for that compound.

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