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Britannica Online Encyclopedia
描述: Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.
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HowStuffWorks explains thousands of topics, from engines to lock-picking to ESP, with video and illustrations so you can learn how everything works.
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4.5 / 5.0, 语: English
Infoplease.com, a free, authoritative, and respected reference for Internet users, provides a comprehensive encyclopedia, almanac, atlas, dictionary, and thesaurus ...
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4.5 / 5.0, 语: English
Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE ...
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4.4 / 5.0, 语: English
The world's largest museum and research complex, with 19 museums, 9 research centers and more than 140 affiliate museums around the world.
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4.5 / 5.0, 语: English
MapsofWorld.com provides free World map, high resolution digital map of the World, vector World maps & World Atlas for iPad, iPhone & Android phones. Maps ...
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Bartleby.com publishes thousands of free online classics of reference, literature and nonfiction
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4.4 / 5.0, 语: English
Peer-reviewed encyclopedia from Google. Articles are written by named contributors.
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3.0 / 5.0, 语: English
Find what you want in a library near you with WorldCat, a global catalog of library collections.
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4.5 / 5.0, 语: English