Sand and Gravel Resources of Sangamon County, Illinois

by Alan Martin Jacobs, D. L. Stevenson (David Lloyd), Gordon S. Fraser, Harold Wesley Jackman, James Watson Baxter, Norman C. Hester, Paul C. Heigold, R. N. Leamnson, Russel Allen Peppers, Willis L. Busch, Illinois State Geological Survey, Alan T. James, H. H. Damberger, Josephus Thomas, Richard Charles Anderson, Roy John Helfinstine, Henry Phillip Ehrlinger · 1969