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Measurement conversion calculator for metric and imperial systems. Includes
metric charts, tables.
International Bureau of Weights and Measures (BIPM)
BIPM is an international standards organisation (one of the 3 organizations) to maintain the International System of Units (SI) under the terms of the Metre Convention.
USMA - U.S. Metric Association
Founded in 1916, it advocates U.S. conversion to the metric system.
Wikipedia - Metric System
Information about metric system, history, units.
Wikipedia - Imperial Units
Information about imperial system, history, units.
Wikipedia - U.S. Customary Units
Information about U.S. customary units, history.