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Specialized Reference Engines
- 4 Anything Network – The 4Anything Network is comprised of web guides that help you find high quality, relevant information online for thousands of topics and cities.
- Information Please Almanac – Information Please is the world's largest free reference site. Here you can find facts on thousands of subjects including sports, entertainment, technology, business, education, and health.
- Ixquick Metasearch – Ixquick submits your search to the major search engines and finds sites that are universally ranked in the top ten.
- OCLC Periodical Titles – Researchers, students, faculty, scholars, professional librarians and other information seekers can use OCLC services to obtain bibliographic, abstract and full-text information when and where they need it.
- Search Engine Colossus: International Directory of Search Engines – Gain quick, efficient access to search engines from countries around the world with Search Engine Colossus - International Directory of Search Engines.
- Xrefer – xrefer combines reference books from the world's leading publishers, delivering 24/7 online reference services for libraries.