The Political Writings of Jean Jacques Rousseau, ed. from the original manuscripts and authentic editions, with introductions and notes by C. E. Vaughan. (Cambridge University Press, 1915). In 2 vols. http://oll.libertyfund.org/titles/1880,
A 2 volume collection of Rousseau’s works (in French) edited and with thoughtful and helpful introductions by Vaughan in 1915.
The text is in the public domain.