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Raster Dataset
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Subject
Imagery and Base Maps
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Year
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...