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Internet search engines

• Google Advanced Search

• AllTheWeb
• AltaVista
• HotBot
• Teoma
• Yahoo Search

Metasearch engines

Metasearch engines search multiple search engines at once and return integrated results.

• Dogpile
• Vivisimo

Search tutorials

• Google Guide
• How to use search engines
• Finding information on the Internet
• How to find the 'invisible web'

Science website search tools

• Scirus

Background on search engines

• Search Engine Watch
• What's not indexed by search engines