The world wide web has become so large so fast that sophisticated search engines are just scratching the surface of its vast information reservoir, according to a study released July 26.

The 41-page research paper, prepared by a South Dakota company that has developed new software to plumb the internet's depths, estimates the web is 500 times larger than the maps provided by popular search engines like Yahoo!, AltaVista, and Google.com.

These hidden information mines, well-known to the net-savvy, have become a tremendous source of frustration for educators and researchers

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