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Catalog of U.S. Government Publications
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The Catalog is a search and retrieval service that provides bibliographic records of U.S. Government information products. Use it to link to Federal agency online resources or identify materials distributed to Federal Depository Libraries. Coverage begins with January 1994 and new records are added daily. New Electronic Titles contains online titles that are the latest entries in the Catalog or are in the queue to be added to it.
National Science Digital Library
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NSDL is the Nation's online library for education and research in Science, Technology, Engineering, Mathematics.
Science.gov : USA.gov for Science - Government Science Portal
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Science.gov searches over 42 databases and over 2000 selected websites, offering 200 million pages of authoritative U.S. government science information, including research and development results.
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Search over 3.5 million documents, plus patents and government data. Leading society publishers spanning 350 years of sci-tech scholarship help you with your queries.
United States Geological Survey
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As an unbiased, multi-disciplinary science organization that focuses on biology, geography, geology, geospatial information, and water, we are dedicated to the timely, relevant, and impartial study of the landscape, our natural resources, and the natural hazards that threaten us.
