Sites vergelijkbaar Britannica.Com

HowStuffWorks explains thousands of topics, from engines to lock-picking to ESP, with video and illustrations so you can learn how everything works.

Infoplease.com, a free, authoritative, and respected reference for Internet users, provides a comprehensive encyclopedia, almanac, atlas, dictionary, and thesaurus ...

Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE ...

The world's largest museum and research complex, with 19 museums, 9 research centers and more than 140 affiliate museums around the world.

MapsofWorld.com provides free World map, high resolution digital map of the World, vector World maps & World Atlas for iPad, iPhone & Android phones. Maps ...

Bartleby.com publishes thousands of free online classics of reference, literature and nonfiction

Peer-reviewed encyclopedia from Google. Articles are written by named contributors.

Find what you want in a library near you with WorldCat, a global catalog of library collections.