Application of manure phosphorus generated at cattle animal feeding operations to nearby farmland within the Pacific drainages of the United States (2012)
The U.S. Geological Survey (USGS) is developing SPARROW models (SPAtially  
Related Regressions On Watershed Attributes) to assess the transport of contaminants (e.g., nutrients) through the Pacific drainages of the United States (the Columbia River basin; the coastal drainages of Washington, Oregon, and California; …