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
  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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