Encyclopedia - Britannica Online Encyclopedia
Official site of the Encyclopedia Britannica, one of the world's best-known reference books. Find short encyclopedia entries and definitions, or register for complete access.
http://www.britannica.com/
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Online Dictionary, Encyclopedia and Thesaurus. Free access.
Acronym Finder: TFD stands for Time-Frequency Digitizer ... MLA style: "TFD." Acronym Finder. 2009. ... S.v. "TFD. ...
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Encyclopedia
TFD Encyclopedia includes Computer Desktop Encyclopedia, Columbia Encyclopedia and many other great sources.
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Virtual Learning Resources Center - access to quality Internet Reference and Information Sources
Information finding site, created by a librarian, for secondary school students and teachers; gives easy access to pre-selected and evaluated information resources.
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ScienceWorld
Comprehensive online encyclopedias of astronomy, math, physics, scientific biographies, and scientific books, with many equations and formulas.
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the encyclopaedia of informal education
exploring the theory and practice of informal education, lifelong learning and ... infed.org is an independent and not-for-profit site [about us] [disclaimer] ...
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IPL Kidspace
Reference site developed for children ages 4-11, their parents, teachers, and anyone else interested in the literature and information directed to, and about, children.
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Encyclopedia of Earth
Poul Johansen has long experience as project manager and coordinator of large ... He is a Senior Research Scientist at the National Environmental Research ...
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The Canadian Encyclopedia Online
Searchable full-text version. Features articles, retrospectives, interactive maps, games, and more.
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Virtual Reference Shelf - Selected Web Resources (Library of Congress)
Ask a librarian: An online reference service from the Library of Congress that allows researchers to submit reference questions to Library of Congress reading rooms ...
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Internet Scout Project
Home of the Scout Report, the Internet's longest-running weekly publication.
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