1994. Schruben, Arndt, and Bawiec. This dataset is a digital representation of the King and Beikman map. In 1974 the U.S. Geological Survey published a new Geologic Map of the United...
1994. U.S. Department of Agriculture, Natural Resources Conservation Service. This data set is a digital general soil association map developed by the National Cooperative Soil Survey. It consists of a broad based inventory o...