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How Many?: A Dictionary of Units of Measurements
Includes all the units of the International System of Weights and Measures (SIPM); metric; non-metric scientific units such as the astronomical unit, the electron volt, and the parsec; the English Customary Weights and Measures; selected traditional units from cultures other than English; and other measurement terms and notations. Each unit's definition includes conversion factors.
http://www.unc.edu/~rowlett/units/
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