National Water-Quality Assessment (NAWQA) Program
Nutrients National Synthesis
OTHER DATA SETS
Alexander,
R.B. and Smith, R.A., 1990, County-Level Estimates of Nitrogen and
Phosphorus Fertilizer Use in the United States, 1945 to 1985: USGS
Open-File Report 90-130.
Alexander, R.B., Slack,
J.R., Ludtke, A.S., Fitzgerald, K.K., Schertz, T.L., 1996, Data from
Selected U.S. Geological Survey National Stream Water-Quality
Monitoring Networks (WQN): USGS Digital Data Series DDS-37.
Nolan, B.T.,
Hitt, K.J., and Ruddy, B.C., Probability of nitrate contamination of recently
recharged ground waters of the conterminous United States
Puckett,
L.J., Alexander, R.A., and Hitt, K.J., 1998, County-based estimates of
nitrogen and phosphorus content of animal manure in the United States
for 1982, 1987, and 1992.
