A Digital Line Graph is simply an digital representation of cartographic information derived from USGS sources. In the DLG below, borders, lakes, and rivers are shown, other terrain features are not.
> Source: http://www.versamap.com/UsgsDlg_CaNvAzUt.png
> Source: http://www.versamap.com/UsgsDlg_CaNvAzUt.png
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