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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.
