Search Engines For the Invisible Web

There are many websites and resources on the Internet that cannot be reached by querying the major search engines. Fortunately, there are other ways to reach this Invisible Web. This article discusses the various kinds of search engines and databases that can be used for exploring this hidden gold mine of information.
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Search Directories For the Invisible Web

Google indexes billions of Web pages, but there are many more billions of Web pages and websites that the major search engines cannot reach. In fact, by some estimates, this “Invisible Web” is 500 times the size of the visible one. Fortunately for searchers, there are ways to access this treasure trove. This article explains how search directories work, and what can be found by using some of the major ones.
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Navigating the Invisible Web

What do the majority of people do when searching for information on the Web? They fire up Google (or occasionally another search engine) and rely on the returned results to find what they are looking for. In many cases you are lucky enough to find among the first 10, 20, or 30 results the stuff you are after but sometimes even browsing the next hundreds of search results does not lead you an inch closer to what you want. It looks like the thing you are looking for is not out there on the Web although your internal voice tells you that this is impossible; it must be there!
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