Monitoring data to calibrate the models are from 65 nitrogen sites and 67 phosphorus sites that had appropriate stream-loading data and were included in the model.

Nutrient-load measurement sites
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Nutrient sources and processes data as geographic information systems (GIS) layers were used to summarize and quantify watershed characteristcs. (Sources of GIS data layers are provided in table 1 on page 7 of the report).

Nutrient sources and processes data
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Or Text-only List of Data Layers