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Reference Sites

The following sites contain links to online reference tools: almanacs, encyclopedias, fact books, dictionaries, thesauri, quotes, directories, statistics, atlases, grammar guides, calendars, weights & measures, more.

See also Reference databases.


General Sites



  • Acronym Finder - 252,000+ acronyms, abbreviations, and their definitions.


Calculators & Converters

  • CalculatorPLUS.com - Free business & financial calculators includiing mortgage loan, credit card, insurance, interest rate, savings, refinance, retirement, and auto finance.
  • ConvertIt.com - Measurements, exchange rates, time zones, calculators, more.
  • Convert-me.com - Convert weight, temperature, speed, etc.
  • Currency Converter - Multilingual Foreign Exchange calculator.
  • DollarTimes.com - Financial calculators covering home & car loans, investment & savings, and personal finance.




  • Infobel - Links to online telephone directories.


Population Counts

  • Population Counts - Current U.S. and world population estimates from the U.S. Census Bureau.


Time Zones


Zip Codes

  • ZIP Codes - ZIP Code lookup from the U.S. Postal Service.
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