The Chief Works of Benedict de Spinoza, translated from the Latin, with an Introduction by R.H.M. Elwes. Revised edition (London: George Bell and Sons, 1891). 2 vols. http://oll.libertyfund.org/titles/1852,
A 2 volume collection of Spinoza’s most important works. Vol. 1 contains the Theologico-Political Treatise and the posthumous Political Treatise. Vol. 2 contains On Improvement of Understanding, Ethicas, and Letters.
The text is in the public domain.