http://www.mapcruzin.com/free-geodata-shapefiles/usgs-geospatial-data-geodata-geographic-download.htm
Above is a DLG map, which is also known as a Digital Lin Graph map. This map type is a cartographic feature that is used to represent a digital vector that is distributed by the U.S. Geological Survey. DLG's are collected from USGS maps and a represented in large and both small scale forms with various different categories of features. This particular DLG is representing the state of Illinois from the data provided by the USGS map information.
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