777 and Other Qabalistic Writings of Aleister Crowley is a foundational reference book, edited by Dr. Israel Regardie, collecting essential Kabbalistic texts used in Ceremonial Magick. It includes 777 (a comprehensive table of correspondences), Gematria (numerical analysis), and Sepher Sephiroth (a numerical Hebrew dictionary). This collection is widely recognized as an indispensable, comprehensive reference for anyone practicing or studying Qabalah and practical magick.