Language Arts

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Visual Thesaurus: http://www.visualthesaurus.com UN: rhs.vt@laus.net, PW: riders
English Literature Topics: http://www.bbc.co.uk/schools/gcsebitesize/english_lierature/
Bartleby.com: http://www.bartleby.com/
Poetry 180- http://www.loc.gov/poetry/180/
American Heritage Dictionary of the English Language: http://www.bartleby.com/61/
Merriam Webster’s Collegiate Dictionary free version: www.m-w.com    
M-W Open Dictionary: http://www3.merriam-webster.com/opendictionary/

Roget’s Thesaurus II is at http://www.bartleby.com/62/  
An older edition is at http://www.lib.uchicago.edu/efts/ARTFL/newhome/ref 
Merriam-Webster Online Thesaurus http://www.m-w.com/mw/thesaurus.html
Bartlett’s Familiar Quotations: http://www.bartleby.com/100))
Biblical Reference Guide: http://www.blueletterbible.org/ 
Bartleby English Usage guides at http://www.bartleby.com/usage/

Onelook Dictionary Search: http://onelook.com 
Dictionary.com: http://dictionary.com
Your Dictionary: http://yourdictionary.com  
Internet Public Library Dictionaries: http://www.ipl.org/div/subject/browse/ref28.00.00/
Various quotation, thesauri and usage tools: http://www.bartleby.com/reference/

Math

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AAA Math: http://www.aaamath.com
Practical Algebra Lessons: http://www.purplemath.com/modules/
Online Math Learning: http://www.onlinemathlearning.com/
Math Dictionary for Kids: http://www.teachers.ash.org.au/jeather/maths/dictionary
Mathematics Encyclopedia: http://www.mathacademy.com/pr/prime/index.asp
Units of Measurement Dictionary: http://www.unc.edu/~rowlett/units/index.html

Science

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Science.gov: http://www.science.gov/
Shambles: http://www.shambles.net/science/
Comic Book Periodic Table: http://www.uky.edu/Projects/Chemcomics/
Periodic Table: http://periodic.lanl.gov/
Virtual Biology Lab: http://bio.rutgers.edu/
NASA for Students: http://www.nasa.gov/audience/forstudents/index.html
Nanotech KIDS: http://www.nanonet.go.jp/english/kids

Art and Music

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Art History: http://witcombe.sbc.edu/ARTHLinks.html
Origami: http://www.langorigami.com/
Music dictionary: http://www.dolmetsch.com/musictheorydefs.htm

Social Studies

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History Place: http://www.historyplace.com/
Chronicling America: http://www.loc.gov/chroniclingamerica/
Remember.org: http://remember.org/
Map collection: http://www.lib.utexas.edu/maps/histus.html
The New York Times on the Web Learning Network: http://www.nytimes.com/learning/students/index.html
This Day in History: http://www.history.com/this-day-in-history.do
Today in History: http://memory.loc.gov/ammem/today/archive.html
Hyperhistory Online: http://www.hyperhistory.com/online_n2/History_n2/a.html
CIA World Factbook: http://www.cia.gov/cia/publications/factbook/

General Information

Time Almanac: http://www.infoplease.com/almanacs.html
Old Farmer's Almanac: http://www.almanac.com/
Current Library of Congress catalog – http://catalog.loc.gov
Current British Library Catalogue – http://catalogue.bl.uk
WorldCat (OCLC) - Open Access WorldCat: http://www.worldcat.org
California Libraries Catalog (CAtalog): http://www.calcat.org
LINK+: http://csul.iii.com/
Polk’s city directories ~ info: http://www.citydirectory.com
Zip + 4 directory: http://zip4.usps.com/zip4/
Anywho: http://www.anywho.com/
Switchboard: http://www.switchboard.com
Internet 800 directory: http://inter800.com/
Infobel world telephone directory: http://www.infobel.com/teldir/default.asp
Biography.com:  http://www.biography.com
Who2: http://www.who2.com/
Biographical dictionary s9.com:  http://www.s9.com/biography/search.html