1991+ Physics and mathematics e-print server.
Research Database: Engineering and Physics
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ArXiv.org
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Conference Papers Index
1982+ Papers and poster sessions presented at major international scientific meetings.
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Elsevier Science Direct
Single search interface to > 2,500 journals, books & reference works in life, physical, medical, technical and social sciences.
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Energy Citations Database
1943+ Energy and energy related unclassified science and technology information.
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Google Scholar
From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations.
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Internet Archive (access the WayBack Machine)
A digital library of Internet sites and other cultural artifacts in digital form.
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ISI Science Citation Index (Web of Science)
1965+ Citation Index with cited reference searching which tracks articles that have cited a specific work by an author.
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JSTOR
JSTOR offers a high-quality, interdisciplinary archive to support scholarship and teaching. It includes archives of over one thousand leading academic journals across the humanities, social sciences, and sciences.
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National Technical Information Service (NTIS)
1990+ Government-funded scientific, technical, engineering, and business related information from 200 federal agencies.
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NetLibrary
Thousands of ebooks available for check ou t