U.S. Geological Survey Elevation-Hydrography Breakline ... · U.S. Geological Survey Elevation-Hydrography Breakline Specifications ... The U.S. Geological Survey (USGS) is developing
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DIRECTORY OF COAL MINES IN ILLINOIS€¦ · ILLINOIS STATE GEOLOGICAL SURVEY E. Donald McKay III, Director Natural Resources Building 615 East Peabody Drive Champaign, Illinois 61820
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