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Amedeo Avogadro
http://www.bulldog.u-net.com/avogadro/avoga.html
Brief biography and description of work. Explanation of Avogadro's number and its significance.
Amedeo Avogadro
http://chemistry.about.com/library/weekly/aa111602a.htm
Brief description of work and its importance, links to other resources.
Essay on a Manner of Determining the Relative Mass
http://webserver.lemoyne.edu/faculty/giunta/avogadro.html
Avogadro's 1811 Journal de Physique paper.