777 And Other Qabalistic Writings of Aleister Crowley: Including Gematria & Sepher Sephiroth, edited with an introduction by Israel Regardie, the 20th printing of the 1986 paperback edition from Weiser Books, is part of the collection at the Reading Room.

“This collection of Qabalistic texts is without parallel in the history of mystical literature. Edited and introduced by Dr. Israel Regardie, the three texts included are Gematria, 777, and Sepher Sephiroth.
Gematria, reprinted from “The Temple of Solomon the King,” The Equinox, Vol. 1, No. 5. It provides essential explanations of theoretical and practical Qabalistic number analysis and philosophy. “An Essay in Number,” also included, provides invaluable insights into key numbers as well as techniques and safeguards for practical magical work.
777 itself contains, in concise tabulated form, an overview of the symbolism of the major world religions, as well as the system of correspondence of the Hermetic Order of the Golden Dawn. In short, it is a complete magical and philosophical dictionary—a key to all religion and practical occultism—an amazing work whose value has been recognized through many editions since its first appearance in 1909 and subsequent enlargement in 1955.
The third text is Sepher Sephiroth, a unique dictionary listing hundreds of Hebrew words arranged by numerical value. It was compiled jointly by Crowley and Allan Bennett and first appeared in The Equinox, Vol. 1, No. 8.”
The Hermetic Library Reading Room is an imaginary and speculative future reification of the library in the physical world, a place to experience a cabinet of curiosities offering a confabulation of curation, context and community that engages, archives and encourages a living Western Esoteric Tradition. If you would like to contribute to the Hermetic Library Reading Room, consider supporting the library or contact the librarian.