Amedeo Avogadro
   Brief description of work and its importance, links to other resources.
   http://chemistry.about.com/library/weekly/aa111602a.htm

Essay on a Manner of Determining the Relative Masses of the Elementary Molecules
   Avogadro's 1811 Journal de Physique paper.
   http://webserver.lemoyne.edu/faculty/giunta/avogadro.html