Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Nutrient Inputs from Fertilizer and Manure, Nitrogen and Phosphorus (N&amp;P), 2002
This data set represents the estimated amount of nitrogen and phosphorus in kilograms for the year 2002, 
compiled for every catchment of NHDPlus for the conterminous United States. The source data set is 
County-Level Estimates of Nutrient Inputs to the Land Surface of the Conterminous United States, 
1982-2001 …