Nutrient Trends in Streams and Rivers of the United States, 1993?2003 Image Date Issued 2009 Author Sprague, Lori A. Mueller, David K. Schwarz, Gregory E. Lorenz, David L. Main Topic Water Conveyance & Hydraulics Water Monitoring & Assessment
County-level estimates of nutrient inputs to the land surface of the conterminous United States, 1982-2001 Image Date Issued 2006 Author Ruddy, Barbara C. Lorenz, David L. Mueller, David K. Main Topic Water Conveyance & Hydraulics Water Economics
