http://tahoe.usgs.gov/DLG.html
DLG is an acronym for Digital Line Graph. A DLG is a map of geographic features that is made from digital vector data to represent cartographic information. There are three different scales for digital Line Graphs, large scale, intermediate scale, and small scale. Large-scale maps are produced in 7.5- by 7.5-minute units; Intermediate in 30- by 30-minute units, and Small-scale maps are 1:2 million-scale topographic quadrangle maps. The DLG above is of
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