The Economic Writings of Sir William Petty, together with The Observations upon Bills of Mortality, more probably by Captain John Graunt, ed. Charles Henry Hull (Cambridge University Press, 1899), 2 vols. http://oll.libertyfund.org/titles/1859,
A 2 volume collection of Petty’s writings, along with a lengthy introduction on Petty’s life and times and economic thought.
The text is in the public domain.