Environmental and Biological Data of the Nutrient Enrichment Effects on Stream Ecosystems Project of the National Water Quality Assessment Program, 2003

Data Series 345

U.S. GEOLOGICAL SURVEY
Data Series 345

Figure - refer to figure caption for alternative text description

Figure 1. Agricultural nutrient gradient study areas of the Nutrient Enrichment Effects on Stream Ecosystems Study of the National Water Quality Assessment Program, 2003–04. Shaded portions of the study areas reflect the ecoregion where samples were collected.

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