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Scientific Investigations Report 2006–5101–D

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

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Figure 14. Relation between the urban intensity index (UII) and (A) chlorophyll-a and (B) ash-free dry mass, Willamette River basin and surrounding area, Oregon and Washington. (Shading represents concentrations of chlorophyll-a, greater than 100 mg/m2).

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