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See also:

• Business: Business Services: Supplies and Equipment: Time Recording and Management  (99)
• Computers: Software: Accounting: Time Tracking  (117)
• Computers: Software: Human Resources: Time Keeping Systems  (55)
• Science: Astronomy: Calendars and Timekeeping  (55)

• Cesium Atomic Clocks - Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.
• Doug's Atomic Clocks - Details on Doug Hogarth's experiments with his atomic clock.
• How Stuff Works: Atomic Clock - Concise history, background, definitions and operational information regarding atomic clocks.
• How Stuff Works: Pendulum Clock - Concise description using drawings and animation to show the operation of a pendulum clock.
• Smithsonian Institute - On Time - History of the clock and how Americans have measured time and been affected by it.

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