The Avogadro Project

http://physics.nist.gov/Divisions/Div842/Gp5/crystalc.html

http://www.irmm.jrc.be/

http://www.ptb.de/en/suche/_index.html

http://www.bipm.fr/enus/3_SI/base_units.html#kilogram

Finding Si atoms with Cu (Powerpoint presentation)
       
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