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NIST Time and Frequency Division

http://www.boulder.nist.gov/timefreq/

The National Institute of Standards and Technology maintains time and frequency standards for the United States.

A Walk Through Time

http://physics.nist.gov/GenInt/Time/time.html

Evolution of timekeeping through the centuries.

U.S. Time Zones

http://aa.usno.navy.mil/faq/docs/us_tzones.html

History of standard time in the U.S.

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