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Geologic map, Illinois River Basin : Benton, Crawford and Washington counties, Arkansas, Adair, Cherokee, Delaware and Sequoyah counties, Oklahoma
In left lower margin: July 1990 1006159. "Base compiled from 1:250,000 AMS quadrangles and information from SCS field personnel." "Geologic map information compiled from 1:250,000 USGS Oklahoma geologic map and 1:500,000 USGS Arkansas geologic map." Includes location map. Available also through the Library of Congress Web site as a raster image.
National Cartographic Center (U.S.) - United States. Soil Conservation Service