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Specialized Reference Engines
- Ixquick Metasearch – Ixquick submits your search to the major search engines and finds sites that are universally ranked in the top ten.
- 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.