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

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