Reference » Encyclopedias

Encyclopedias

Britannica Concise
[ http://concise.britannica.com/ ]

A concise version of the Encyclopedia Britannica. Has around 28,000 articles online.

Encyclopedia Smithsonian
[ http://www.si.edu/Encyclopedia_SI/ ]

Smithsonian resource site. Offers answers for questions ranging from A to Z and can be searched by keyword.

PlanetMath
[ http://planetmath.org/ ]

A math encyclopedia that features articles that have been peer reviewed.