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- Constants, Units, and Uncertainty - National Institute of Standards and Technology (NIST)
A reference with three sections: Fundamental Physical Constants (values of the constants and related information, and a searchable bibliography on the constants); the International System of Units (in-depth information on the SI, the modern metric system), and guidelines for the expression of uncertainty in measurement.
- A Dictionary of Units - Cleave Books
A summary of units of measurement world-wide (current units and a few of historical interest); conversion factors to the SI (Systeme International); an outline of the SI; its basic defining standards and some of its derived units; all the SI prefixes and some notes on conventions of usage; a short historical note on measures generally; descriptions of the Metric system, the UK (Imperial) system with a statement on the implementation of 'metrication' in the UK, and the US system; and a list of other resources (including other Web sites).