Reference

Reference


Invisible (Deep)  Web Research Tools

"Searching on the Internet today can be compared to dragging a net across the surface of the ocean.  While a great deal may be caught in the net, there is still a wealth of information that is deep, and therefore, missed.  The reason is simple: Most of the Web's information is buried far down on dynamically generated sites, and standard search engines never find it.

 Traditional search engines create their indices by spidering or crawling surface Web pages.  To be discovered, the page must be static and linked to other pages.  Traditional search engines can not "see" or retrieve content in the deep Web - - those pages do not exist until they are created dynamically as the result of a specific search.  Because traditional search engine crawlers can not probe beneath the surface, the deep Web has heretofore been hidden" Michael K. Bergman

Virtual Reference Library

Library of Congress Online Catalog

New York Public Library Databases Online

SearchSystems Public Records Directories

Genius Find

Comparitech

MedBioWord: Science & Medical Journals & Databases

ProFusion

Meta-Search Engines

Meta-search engines submit keywords in its search box, and it transmits your search simultaneously to several individual search engines and their databases of web pages.  Within a few seconds, you get back results from all the search engines inquired.  Meta-search engines do not own a database of Web pages; they send your search terms to the databases maintained by search engine companies.  "Smarter" meta-searcher technology includes clustering and linguistic analysis that attempts to show you themes within results, and some fancy textual analysis and display that can help you dig deeply into a set of results.

Clustering Engines

 

   

FactBites 

Surfwax

Copernic Agent

 

 

 

Useful Sites

 

Fact Monster

Reference Desk

Dictionary

Answers

Biographies

Lonely Planet

Sparknotes

Science Direct 

 

Regular Search Engines

 

Google

Accoona

GigaBlast

Ask.com

AltaVista

MSN.com

Lycos

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