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Weights & Measures
How Many? Dictionary of Units of Measurement
University of North Carolina : A site with definitions with units in English Customary, Metric and International Systems. Information organized by subject and includes "Index of Tables and Scales" as well as a "What's New" section for updates on international developments.
Convert length, weight, pressure or volume from either metric or imperial measurements.
Currency Converter (Bank of Canada)
Convert to any international currency.