This map was made using Digital Line Graph (DLG) data at a source scale of 1:100,000. DLGs portray the linear information contained on the USGS topographic maps, such as transportation networks, hydrography, boundaries, elevation contours, and manmade features.
More information:
Digital raster graphics (scanned topographic map) of a part of Athens
Geologic setting -- Piedmont Physiographic Province
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