Philosophical Works of David Hume
Vol. 1 - Treatise of Human Nature Bk 1; Vol. 2 - Treatise of Human Nature Bk 2 and 3; Vol. 3 - Essays Moral, Political and Literary; Vol. 4 An Inquiry Concerning the Human Understanding, An Inquiry Concerning the Principles of Morals, Appendix, The Natural History of Religion, Additional Essays.
The Philosophical Works of David Hume. Including all the Essays, and exhibiting the more important Alterations and Corrections in the successive Editions by the Author. In Four Volumes. (Edinburgh: Adam Black and William Tait, 1826).
The text is in the public domain.