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Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.

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Wikimedia is a global movement whose mission is to bring free educational content to the world.

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Learn how to do anything with wikiHow, the world's most popular how-to website. Easy, well-researched, and trustworthy instructions for everything you want to know.

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Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.

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Wiktionary.

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The World's most comprehensive free online dictionary, thesaurus, and encyclopedia with synonyms, definitions, idioms, abbreviations, and medical, financial, legal specialized dictionaries

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SAGE is a global academic publisher of books, journals, and a growing suite of library products and services.

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HowStuffWorks explains thousands of topics, ranging from the flu to black holes to conspiracy theories, with video and illustrations so you can learn how everything works.

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Reach your academic happy place with access to thousands of textbook solutions written by subject matter experts.

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Wikisource.

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無料ウェブ百科事典。VOYAGEGROUPと朝日新聞社が運営。出典を明確にした信用性を重視。

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Answers.com is the place to go to get the answers you need and to ask the questions you want

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Reference.com is the #1 question answering service that delivers the best answers from the web and real people - all in one place.

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Wikibooks is a Wikimedia community creating a free library of educational textbooks that anyone can edit.

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World Map / World Atlas / Atlas of the World Including Geography Facts and Flags - Worldatlas.com - WorldAtlas.com.

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India Map - Maps of India is the largest resource of maps on India. We provide political, travel, outline, physical, road, rail maps and Information for all states, union territories, cities, districts and villages.

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Home - Encyclopaedia Metallum: The Metal Archives.