The encyclopedia of earth [electronic resource].
- Washington, D.C. : NCSE
- "... a new electronic reference about the Earth, its natural environments, and their interaction with society. The Encyclopedia is a free, fully searchable collection of articles written by scholars, professionals, educators, and experts who collaborate and review each other's work."--About page (viewed May 13, 2011).
- Title Variation
- Updated frequently
- Title from title screen, publisher's website (viewed May 13, 2011).
- Supported by the Environmental Information Coalition and the National Council for Science and the Environment.