National Atlas of the United States- an interactive database
Source: United States Geological Society (USGS)
Map Description:
This website is a collaborative effort of over twenty different federal government agencies. Among these agencies are the U.S. Forest Service, the U.S. Bureau of the Census, the EPA and the USGS. This site's interactive map database contains national, as well as regional, information from a wide range of catagories. These include biology, boundaries, environment, geology, demographics, transportation, and reference maps. It also provides access to aerial photographs and some animated maps. There are over 150 individual map layers, with more being added.

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