DLGs are digital vector representations of topographic and planimetric map features derived from either aerial photographs or from cartographic source materials, using manual and automated digitizing methods. DLGs contain a wide variety of information including topography, hydrography, political and administrative boundaries, roads, vegetative surface cover, etc.
This DLG file shows the transportation available for sale and the transportation in progress in Illinois.
http://pubs.usgs.gov/of/2003/of03-471/domier/index.html
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