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50-0008 [Internet Resource] The National Map, from the U.S. Geological Survey. URL: http://nationalmap.gov/
[Visited Jun'12] The National Map is a gateway to several resources developed by the US Geological Survey: the National Atlas of the United States (Nationalatlas.gov, CH, Nov'06, 44-1302), US Topo, the Historical Topographic Map Collection, and the National Map Viewer. The site also provides links to USGS Fact Sheets, information products, news releases, standards, and other information about maps and mapping. The National Atlas is an interactive...