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GreenFILE is an indexing and abstracting database covering aspects of human impact to the environment. Its collection of scholarly, government and general-interest titles includes content on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more.
GeoRef provides access to the geoscience literature of the world, and contains references to geoscience journal articles, books, maps, conference papers, reports and theses. It was established by the American Geological Institute (AGI), and includes references to all publications of the U.S. Geological Survey.