Mystical Theology
Edited by Arthur Versluis. The influence of this short work can hardly be overstated. Apophatic mysticism.
On the Divine Names and the Mystical Theology
C.E. Rolt translation, edited by W.J. Sparrow-Simpson. XML/HTML e-text and page images.
The Celestial Hierarchy
Discusses the angelic orders. Edited by Arthur Versluis. 170K.