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Topographic Map Symbols
This online guide has three brief descriptive sections: "What is a Topographic Map?"; "Reading Topographic Maps"; and "Topographic Map Information," which includes information on buying topo maps. Explains map symbols for elevation; boundaries; land surface features; water features; buildings and related features; and roads, railroads, and transmission lines and pipelines. From the U.S. Geological Survey (USGS).
http://egsc.usgs.gov/isb/pubs/booklets/symbols/reading.html
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