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Author/Creator
- Geological Survey (U.S.)12
- Du Page County (Ill.). Department of Environmental Concerns2
- Franz, Delbert D.2
- Illinois. Office of Water Resources2
- Melching, Charles S.2
- Outlaw, George S.2
- Eash, David A.1
- Galeone, Daniel G.1
- Gonzalez, Ralph1
- Hejl, H. R.1
- Hodgkins, Glenn1
- Iowa. Highway Division1
- Iowa. Highway Research Board1
- Jackson, K. Scott1
- Jennings, Marshall E.1
- Johnson, Karl G.1
- Ohio. Department of Natural Resources1
- Pennsylvania. Bureau of Land and Water Conservation1
- Puerto Rico. Department of Natural and Environmental Resources1
- Slade, R. M.1