Encyclpedias, Mathematics, Research, K-12

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Encyclpedias, Mathematics, Research, K-12 CIA - The World Factbook http://www.odci.gov/cia/publications/factbook/index.htm The first classified Factbook was published in August 1962, and the first unclassified version was published in June 1971. The NIS program was terminated in 1973 except for the Factbook, map, and gazetteer components. The 1975 Factbook was the first to be made available to the public with sales through the US Government Printing Office (GPO). The Factbook was first made available on the Internet in June 1997. The year 2003 marks the 56th anniversary of the establishment of the Central Intelligence Agency and the 60th year of continuous basic intelligence support to the US Government by The World Factbook and its two predecessor programs. Columbia Encyclopedia http://www.bartleby.com/65/ Containing nearly 51,000 entries (marshalling six and one-half million words on a vast range of topics), and with more than 80,000 hypertext cross-references, the current Sixth Edition is among the most complete and up-to-date encyclopedias ever produced. Encyclopedia.com http://www.encyclopedia.com/ Encyclopedia.com, the Internet's premiere free encyclopedia, provides users with more than 57,000 frequently updated articles from the Columbia Encyclopedia, Sixth Edition. Each article is enhanced with links to newspaper and magazine articles as well as pictures and maps - all provided by eLibrary. Wikipedia http://en.wikipedia.org/wiki/Main_Page Wikipedia is a free content wiki encyclopedia being written collaboratively by contributors from around the world. As of May 2004, there are 261003 articles in English; every day hundreds of thousands of visitors from around the world make tens of thousands of edits and create thousands of new articles.  . MSN Encarta - Encyclopedia Article Center http://encarta.msn.com/artcenter_0/Encyclopedia_Articles.html#tcsel Search more than 4,500 articles on the world of knowledge--from aardvark to Zambia. HighBeam Research http://www.highbeam.com/library/index.asp?refid=elearners Search this extensive archive of more than 32 million documents from 2,800 sources —  a vast collection of articles from leading publications, updated daily and going back as far as 20 years. Save your searches, save articles and set up alerts to save time and increase your efficiency. HighBeam Research offers both basic (free) and full membership options.  Questia  http://www.questia.com/ Questia is the first online library that provides 24/7 access to the world's largest online collection of books and journal articles in the humanities and social sciences, plus magazine and newspaper articles. You can search each and every word of all of the books and journal articles in the collection. You can read every title cover to cover. Questia requires a monthly, quarterly or yearly subscription.