Reference

Encyclopedias & Almanacs

• Answers.com
  Locate articles and definitions in online encyclopedias, almanacs and dictionaries.
• Yahoo! Reference
  Search Dictionary, Encyclopedia, the World Factbook, Gray's Anatomy.
• Information Please Almanac
  Facts about the country, states, and current events; lists deaths, disasters, statistics, presidents, and more.

Acronyms & Abbreviations

• Acronym Lookup
  Look up the meanings of acronyms and abbreviations.
• Associations on the Net
  Search Associations on the Internet through the Internet Public Library.

Atlases & Gazetteers

• 50 states
  Choose a state and get hotel info, history, famous citizens, plus official flag, flower, songs, population, tax forms, and more.
• USGS (U. S. Geological Survey)
• Geographic Names Information System
  Location, population, elevation for locations.
• National Atlas
  View, print, download maps of the US.
• National Map
  Current, accurate topographic maps.
• How Far Is It?
  Uses data from the US Census and a supplementary list of cities around the world to find the distance between them as the crow flies.
• United Nations Cartographic Section
  Maps for printing and current geographical names.
• United States Gazetteer - US Census
  Type in the name or ZIP code of any place in the U.S. to get maps and census information.
• The World Gazetteer
  Find current population and administrative areas of countries, cities and towns.
• See also Maps & Historical Maps

Conversions & Calculators

• Google calculator
  Use Google as a mathematical calculator and to convert computer measurements, speed, volume, size, time, etc.
• Calculate Me
  Comprehensive conversion utility converts between any two units.

Calendars & Time

• The American Secular Calendar
• Calculation of the Ecclesiastical Calendar from AD 325 forward
• The Calendar
  Summarizes the history of various calendars used over the centuries.
• Directorate of Time from the U.S. Naval Observatory
• Sunrise/Sunset and Moonrise/Moonset Computations
• Time and Date.com
  A guide to time zones, calendars and more.
• A Walk Though the History of Time
  Learn about the history of timekeeping.
• World Time Zones

Dictionaries & Thesauri

• Dictionary Online (Yahoo!)
  American Heritage Dictionary, fourth ed.
• OneLook Dictionaries
  Indexes over 500 dictionaries on different subject matters along with a "reverse dictionary" which suggests words to match requested meanings.
• Merriam-Webster
  Look up words in College Dictionary or Thesaurus.
• Roget's Thesaurus
  Look up synonyms.
• Thesaurus.com
  Find synonyms and antonyms by word search, category, or headword.
• Webster's Online Dictionary
  Definitions, examples and frequency of usage, and translations for different languages.

Quotations

• Aphorisms Galore!
  Find witty sayings by author or category, read background information, and contribute favorite sayings.
• Bartlett's Familiar Quotations, 1901 ed.
  A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature. Contains over 11,000 searchable quotations.
• The Quotations Page
  Database of over 20,000 quotations, Quotes of the Day, Motivational Quotes, Quotes by Author.
• Quoteland
  Features quotations by topic, literary quotations, special occasion quotes, humorous lines, and quotations by author.
• QuoteWorld
  Contains a search engine for quotes.
• Phrase Finder
  Meaning and origin of English phrases and sayings. Also French phrases, Latin phrases, Bible phrases, etc.

Telephone Directories

• Reference USA - NPL Members only
  Search for over 12 million businesses or 120 million residences by name, location, SIC codes, sales volume or number of employees. Search national white pages by name, location, or phone number. Search for physicians and dentists by location or specialization.
• Area Codes Online Resource
  Find area codes by state.
• Google
  Search residential listings by phone number. Search phone numbers by typing: First Name Last Name City State Abbreviation.
• How to Call Abroad
  Instructions for international calls with links to online phone directories.
• Internet 800 Directory
  Toll free 800 and 888 numbers by business.
• Infobel World
  Telephone directories on the web. Browse international phone directories.
• U.S. Area Code Maps (NANPA)

Zip Code Directories

• Zip Codes (US Postal Service)
• United States Gazetteer (US Census)