History about the SI system
-- US Metric Associotion
International Bureau of Weights & Measures
Moving with Metric
Department of Transpatation, U.S.A.
United States Metric Association
NIST Metric Program
National Institute of Standards and Technology
NIST Physics Laboratory Publications
The International System of Units (SI)
Guide to the Use of the International System of Units (SI)
A Dictionary of Units
-- University of Exeter in Britain.
ASCE Committee on Metrication
, American Society of Civil Engineers.
Conversion Charts and Calculators on the Web
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