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- Directory of Companies in Frequency Control, Timing, and Related Devices
- A Walk Through Time
- Bureau International des Poids et Mesures (BIPM)
- Clocks and time
- Horological Websites
- European Frequency and Time Forum
- Fundamental Physical Constants
- Galileo's Pendulum Clock (USA)
- Galileo's Pendulum Clock (Italy)
- Glossary of Telecommunication Terms
- GPS Internet Connections
- Horological Institute of Japan (in Japanese)
- Horology References (from the Internet Public Library)
- JPL Frequency Standards Laboratory
- National Physical Laboratory, UK, Time and Frequency Section
- National Research Council Canada, Time Services
- NIST Time and Frequency Activities
- Nobel Prize (winners related to frequency control and timekeeping):
Rabi, Ramsey, Dehmelt, Paul, Chu, Cohen-Tannoudji, Phillips, John L. Hall, Theodor W. Hänsch... - Paris Observatory
- PTTI - Index to the Proceedings of the Precise Time and Time Interval (PTTI) Meeting (includes abstracts and full text of some papers)
- Reference Desk - Physics, Chemistry, Engineering, Medical, etc.
- Test & Measurement Application Notes.
- US Naval Observatory, Directorate of Time