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
SPIE Digital Library -The SPIE Digital Library is the most extensive resource available on optics and photonics, providing unprecedented access to more than 450,000 technical papers from SPIE Journals and Conference Proceedings from 1962 to the present. More than 18,000 new technical papers are added annually.