Illinois [cartographic material] / map prepared by Allan Cartography of Medford, Oregon, using base materials from the United States Geological Survey's 1:500,000 scale state map series, and the USGS 3-second digital elevation data base with assistance of A. Jon Kimerling, Department of Geosciences, Oregon State University.
Relief shown by shading, gradient tints, and spot heights. "Elevations are in feet."
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