Bartlett's Familiar Quotations - http://www.bartleby.com/99/index.html The ninth edition of John Bartlett?s classic collection of quotations contains over 9,000 selections from Hesiod and Plutarch, through Chaucer and Thomas ? Kempis, up to the contemporary statesmen of the day.
Internet Public Library http://www.ipl.org/ This popular site is lists reference sources for general topics such as Social Sciences and Humanities. It also contains a number of Pathfinders that are more specific guides to doing research in a parti cular topic, such as Literary Criticism or Job Hunting. Also has a great Shakespeare site, and sections for kids and teens.
Martindale's Reference Desk http://www.martindalecenter.com It's big and ugly, but it's one of the best out there, especially for science and health related information.
Roget's Thesaurus http://thesaurus.com/Roget-alpha-index.html Search the headwords or full text of Roget's Thesaurus, 1911, version 1.02 (supplemented: July 1991) released to the public domain by MICRA, Inc. and Project Gutenberg. Internal cross references are represented as clickable links.
Statistical Abstract of the United States http://www.census.gov/compendia/statab/ The Statistical Abstract of the United States, published since 1878, is the authoritative and comprehensive summary of statistics on the social, political, and economic organization of the United States.
US Gazetteer https://www.census.gov/geo/maps-data/data/gazetteer.html "This gazetteer is used to identify places to view with the Tiger Map Server and obtain census data from the 1990 Census Lookup server. You can search for places, counties or MCDs by entering the name and state abbreviation (optional), or 5-digit zip code."
Web of Online Dictionaries http://www.yourdictionary.com/ "This website indexes on-line dictionaries, thesauri, and such like containing words and phrases. Preference in selection has been given to the free online dictionary of high quality." Also search over 100 different languages.
Yahoo Reference http://dir.yahoo.com/Reference/ One of the most popular reference site directories. Links to Dictionaries, Music Reference, Units of Measurement sites, Population, Quotations, and much more. Fun for browsing.