Web of Science - indexes science, social sciences, and arts and humanities information from nearly 9,300 of the most prestigious, high impact research journals in the world.
Scopus - largest abstract and citation database of peer-reviewed literature: scientific journals, books and conference proceedings
Google Scholar - online, freely accessible search engine that lets users look for both physical and digital copies of articles
Science.gov - searches over 60 databases and over 2200 selected websites from 15 federal agencies
SciFinder-n- provides access to the world's largest and most reliable collection of chemistry and related science information
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Compendex - worldwide coverage of journals and conference publications in all areas of engineering.
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Materials Science Index - comprehensive source for information on metals and alloys: their properties, manufacturing, applications, and development. Information from over 2,000 journals, plus patents, dissertations, government reports, conference proceedings, and books