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2003
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1. Mosaic of Illinois 7.5-minute Digital Raster Graphic (DRG) Images, 2003
2003. Illinois State Geological Survey. This is a statewide ArcSDE Raster Mosaic of USGS DRG images of 7.5-minute topographic quadrangles occurring in Illinois. These are unmodified DRG i...
2. Statewide 30-Meter Digital Elevation Model: Illinois, 2003
2003. Lisa Smith Chris Goldsmith Donald Luman. This data set is a digital elevation model (DEM) of Illinois in ArcInfo grid format. The data are stored in UTM coordinates, using a Transverse Mer...