U.S. Department of Energy Office of Science Office of Scientific and Technical Information

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• Searches 61 science databases and portals sponsored by governments and national institutions in 61 countries

• Covers scientific literature from over three-fourths of the world’s population

• Includes a vast quantity of science (over 400 million pages), much of which is grey literature

• Proving WWS "deep web" value, recent analysis shows only 3.5% overlap with Google and Google Scholar