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This dictionary, from Cleave Books, provides an account of the principal units of measurement to be found in use around the world today, and the conversion factors often needed to change them into standard units of the SI system. It also has a printable two page pocket guide for the most common conversions.
Convert just about any measurement to anything else. The most popular conversions are: length, temperature, speed, volume, weight, cooking, area, fuel economy and currency. Advanced students will also find more specialized conversions of units in mathematics, physics and engineering.