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GIS Color Maps of Ag Fert/Chem Usage



Check out U.S. Geological Survey's Web Page with  
GIS color-coded maps of herbicide and nitrogen 
fertilizer usage at: 

     http://h2o.usgs.gov/public/pubs/bat/bat000.html

This site contains the electronic version of the USGS 
Water-Resources Investigation Report 94-4176: 
 
  "Spatial Data in GIS Format on Agriculture Chemical Use, 
  Land Use, and Cropping Practices in the United States."