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BBC - History - Sir William Petty (1623 - 1687)
http://www.bbc.co.uk/history/historic_figures/petty_william.shtml
Most famous as a political economist and statistician, he made a fortune using soldiers to survey Ireland, and invented the catamaran.
History of Economic Thought ; Sir William Petty
http://cepa.newschool.edu/het/profiles/petty.htm
Biography, links, and works.
Petty, Sir William
http://en.wikipedia.org/wiki/Sir_William_Petty
Article from the Wikipedia open encyclopedia project.
William Petty
http://www.thoemmes.com/dictionaries/petty.htm
From Thoemmes Press' Dictionary of Seventeenth-Century British Philosophers.
William Petty
http://socserv.socsci.mcmaster.ca/~econ/ugcm/3ll3/petty/
E-texts of some of his works.
Works of William Petty
http://www.cpm.ll.ehime-u.ac.jp/AkamacHomePage/Akamac_E-text_Links/Petty.html
Several of his books and notes.