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ushistory.org, created and hosted by the Independence Hall Association in Philadelphia. Colonial and Revolutionary history centered in Philadelphia, PA

Ralph Waldo Emerson, American essayist, poet, and philosopher. This site contains HTML (web-readable) versions of many of Emerson

Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontline, NOVA, PBS Newshour, Masterpiece and many others.

Annotated editions of Thoreau

Comprehensive site for 19th century history, featuring timelines and articles about historical events of the 1800s, including the Civil War, American elections, westward expansion, immigration, and the rise of technology.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

Free online encyclopedia of philosophy, edited by James Fieser and Bradley Dowden. Hosted by the University of Tennessee at Martin.