Search over 60 years of Mathematical Reviews and Current Mathematical Publications. Full text of the reviews is online.
Coverage in many areas, including math. Polk subscribes to approx. 1700 full text journals from 2006 - present.
Science Citation Index
Comprehensive search tool that lets you do a cited reference search.
Search in hundreds of encyclopedias, dictionaries, thesauri, quotations, and subject-specific titles, as well as 200,000+ images and audio files, and nearly 100 videos.
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