Research Beyond Google: 119 Authoritative, Invisible, and Comprehensive Resources

Research Beyond Google: 119 Authoritative, Invisible, and Comprehensive Resources | OEDb
“Google can only index the visible web, or searchable web. But the invisible web, or deep web, is estimated to be 500 times bigger than the searchable web. The invisible web comprises databases and results of specialty search engines that the popular search engines simply are not able to index.” (via J-walk blog)

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