Mysticism and Magick
This is Magick, Liber ABA, Book 4 (Parts 1 & 2). In November 1911, Crowley carried out a ritual during which he reports being commanded to write Book 4 by a discarnate entity named "Abuldiz" (sometimes spelled "Ab-ul-diz" in Crowley's incomplete record of the working). This was duly accomplished at a villa in Posillipo near Naples, Italy, and was published in the winter of 1912-3. Abuldiz appeared in Mary Deste Sturges visions (as Crowley's seer) as an old man with a long white beard wearing a ring which contained a white feather. Liber ABA refers to this work being a part of Crowley's system of libri. In most systems where letters are given numerical value, ABA adds up to 4 (thus the name Book 4). Much of the book was dictated to several of Crowley's students, who would also ask questions to get clarification.