The U.S. Geological Survey
United States Virgin Islands
Gary Johnson,Supervisory Hydrologist Midwest Region,M. Public Administration, University of Illinois B.S. General Engineering, University of Illinois
Johnson, G.P., and Coupe, R.H., 1996, Transport and concentrations of selected herbicides and nitrate in the Sangamon River, Illinois, April 1991 - March 1992, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24,1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, Volumes 1 and 2.
Johnson, G.P., Hornewer, N.J., Robertson, D.M., and Olson, D.T., 2000, Methodology, data collection, and data analysis for determination of water-mixing patterns resulting from operation of aerators and mixers, U.S. Geological Survey Water-Investigations Report 00-4101, 72 pages.
Johnson, G.P., 1998, Water, sediment, and nutrient budgets for the Gillespie Lakes, May 1996- April 1997, Gillespie, Illinois, U.S. Geological Survey Water-Resources Investigation Report 99-69, 62 pages.