http://liveitloveitandbleedit.blogspot.com/2010/04/dlg.html
Digital Line Graphs (DLG) are digital vector data that represent cartographic information. They contain a wide variety of information depicting geographic features like boundaries, hypsography, hydrography, roads, utility lines. The U.S. Geological Survey (USGS) DLG data are classified as large, intermediate, and small scale.
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