Johnson, G.P., Hornewer, N.J., Robertson, D.M., and Olson, D.T., 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., 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, Gary P., 1996, Applications and limitations of dendrogeomorphic method to estimate sedimentation rates in the Kankakee River flood plain in Illinois, in Proceedings of the Sixth Federal Interagency Sedimentation Conference, Las Vegas, NV, March 10-14, 1996, pages P.15-P.18.

Johnson, Gary P., 1997, Instruction manual for USGS sediment observers, U.S. Geological Survey, Open-File Report 96-431, 33 pages.

Johnson, Gary P., Application of an acoustic point velocity meter to measure water velocity profiles induced by air diffusers and mixers, in Proceedings of the ASCE 1999 International Water Resource Engineering Conference Program, Seattle, Washington, August 8-12, 1999.

Johnson, Gary P., and Hayes, R.D., Suspended-sediment budget and yields for the LaGrange Pool of the Illinois River, October 1994- September 1997, in Proceedings of the 7th Federal Interagency Sedimentation Conference, Reno, NV, March 25-29, 2001.

Phipps, R.L., Johnson, G.P., and Terrio, P.J., 1994, Dendrogeomorphic estimate of changes in sedimentation rate along the Kankakee River, near Momence, Illinois, U.S. Geological Survey Water-Resources Investigations Report 94-4190.

Coupe, R.H., and Johnson, G.P., 1991, Triazine herbicides in selected streams in Illinois during storm events, spring 1990, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program- Proceedings of the technical meeting, Monterey Calif., March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034.

Coupe, R.H., and Johnson, G.P., 1991, Triazine herbicides in selected streams in Illinois during storm events, Spring 1990, in Proceedings of the Annual Conference of the Illinois Section of the American Water Resources Association, Peoria, Illinois, October 21, 1991.

Schalk, G.K., Holmes, R.R., and Johnson, G.P., 1998, Chemical and physical data of sediments deposited in the Mississippi and Missouri River flood plains during the July through August 1993 flood, U.S. Geological Survey Circular 1120-L, 62 p.

Oberg, K.A., Holmes, R.R., and Johnson, G.P., 1996, Velocity and scour measurements in and near the Miller City Levee Break, in Proceedings of the Sixth Federal Interagency Sedimentation Conference, Las Vegas, NV, March 10-14, 1996, pages P.75-P.78.

Hornewer, N.J., Johnson, G.P., Robertson, D.M., and Hondzo, M., 1997, Field-scale tests for determining mixing patterns associated with coarse-bubble air diffuser configurations, Egan Quarry, Illinois, in Wang, S.S.Y, ed., Proceedings of the 27th I.A.H.R. Congress, San Francisco, California, August 10-15, 1997.

Holmes, R.R., and Johnson, G.P., 1998, The U.S. Geological Survey in Illinois, in Proceedings of Illinois Water '98 Conference, Urbana, Illinois, November 16-17, 1998.

Robertson, D.M., Hornewer, N.J., Johnson, G.P., Hondzo, M., and Schladow, S.G., Measured and simulated mixing characteristics and patterns associated with bubble-plume aeration, Internet publication in the web page for the USGS surface-water quality and flow modeling interest group, http://smig.usgs.gov/SMIG/uo/features_0997/egan.html