Geologic map of the Stonefort quadrangle, Illinois [cartographic material] / W. John Nelson and D.K. Lumm.
Relief shown by contours and spot heights. "Contour interval 20 feet." "Base from U.S. Geological Survey, 1966. 10,000-foot grid based on Illinois coordinate system, east zone." "Prepared in cooperation with the U.S. Geological Survey, Dallas L. Peck, Director, under the Cooperative Geologic Mapping Program (COGEOMAP)." Includes text, col. stratigraphic column, col. cross section and index and location maps.
Illinois Dept. of Energy and Natural Resources, Illinois State Geological Survey
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