BGN is a Federal body which maintains uniform geographic name usage throughout the Federal Government. For Domestic Names, find maps, longitude, latitude, elevation with the Geographic Names Information System.
EPA's Report on the Environment (ROE) compiles the most reliable indicators currently available to help answer 23 questions in five theme areas (Air, Water, Land, Human Exposure and Health, and Ecological Condition) critical to EPA's mission of protecting the environment and human health.
Sanborn maps are valuable historical tools for urban specialists, geographers, planners, environmentalists, and anyone who wants to learn about the history, growth, and development of American cities, towns, and neighborhoods.
Content ranges from aerial photography of the Yosemite Valley to a 16th-century map of Ireland or of San Francisco following the 1906 earthquake. Best for the area around California, but very good for the rest of the world too.