How Many? A Dictionary of Units of Measurement

This dictionary includes: all the units of the International System of Units (SI); many other units of the metric system used in everyday life or in science, either currently or recently; various non-metric scientific units such as the astronomical unit, the electronvolt, and the parsec; all the units of the English traditional systems I've encountered that can be defined with reasonable precision; selected traditional units from cultures other than English; and certain measurement terms and notations which are not "units of measurement" in a strict sense, but which are used much as if they were.