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Gale Virtual Reference Library is a collection of electronic format Reference titles including multi-volume encyclopedias, biographical collections, business plan handbooks, company history compilations, consumer health references, and specialized reference sources covering the subject areas of arts, biography, business, education, environment, history, law, literature, medicine, multicultural studies, nation and world, religion, science, and social science.

 
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GPO (Government Printing Office) is a collection of U.S. government publications.

 

GreenFILE, providing indexing and abstracts for more than 384,000 records and Open Access full text for more than 4,700 records, offers well-researched information covering all 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, and recycling.

 
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GREENR (Global Reference on the Environment, Energy, and Natural Resources) is an online resource that offers authoritative content on the development of emerging green technologies and discusses issues on the environment, sustainability and more.