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| Hutchinson Encyclopedia - http://encyclopedia.farlex.com/ Resource of 12 million words, with over 75,000 articles as well as 5,000 photos and illustrations, 700 sound files, 70 animations, and over 40 videos. A wealth of supplementary material is also included: thousands of quotations, historical documents, country facts and chronologies, tables and lists. |
| InformationSphere.com - http://www.informationsphere.com/ Online encyclopedia and search engine for terms and definitions. |