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Class A Books are those which may be changed not so much as the style of a letter.  They represent the utterance of an Adept entirely beyond the criticism of even the Visible Head of the Organization. A∴ A∴ Documents in Class A: 
 

Liber I

Liber B Vel Magi

This is an account of the Grade of Magus, the highest grade which it is ever possible to manifest in any way whatever upon this plane. Or so it is said by the Masters of the Temple.
 

Liber VII

Liber Liberi Vel Lapidis Lazuli,
Advmbratio Kabbalæ Ægyptiorvm Sub Figura VII

Being the Voluntary Emancipation of a certain Exempt Adept from his Adeptship. These are the Birth Words of a Master of the Temple.
 

Liber X

Liber Porta Lucis

This book is an account of the sending forth of the Master by the A∴ A∴ and an explanation of his mission
 

Liber XXVII

Liber Trigrammaton

Being a book of Trigrams of the Mutations of the TAO with the YIN and the YANG

Liber LXV

Liber Cordis Cincti Serpente

An account of the relations of the Aspirant with his Holy Guardian Angel. This book is given to Probationers, as the attainment of the Knowledge and Conversation of the Holy Guardian Angel is the Crown of the Outer College. Similarly Liber VII is given to Neophytes, as the grade of Master of the Temple is the next resting-place, and Liber CCXX to Zelator, since that carries him to the highest of all possible grades.  Liber XXVII is given to the Practicus, as in this book is the ultimate foundation of the highest theoretical Qabalah, and Liber DCCCXIII to the Philosophus, as it is the foundation of the highest practical Qabalah.
 

Liber LXVI

Liber Stellæ Rubeæ

A secret ritual, the Heart of IAO- OAI, delivered unto V.V.V.V.V. for his use in a certain matter of “Liber Legis,” and written down under the figure LXVI. This book is sufficiently described by the title.
 

Liber XC

Liber TZADDI Vel Hamus Hermeticus Sub Figura XC

An account of Initiation, and an indication as to those who are suitable for the same.

Liber CLVI

Liber Cheth Vel Vallum Abiegni Sub Figura CLVI

This book is a perfect account of the task of the Exempt Adept, considered under the symbols of a particular plane, not the intellectual.

Liber CCXX

Liber AL Vel Legis Sub Figura CCXX as delivered by LXXVIII unto DCLXVI

This book is the foundation of the New Æon, and thus of the whole of our Work.

Liber CCXXXI

Liber Arcanorum του TAHVTI QUAS VIDIT ASAR IN AMENNTI
Sub Figura CCXXXI Liber Carcerorum των QLIPHOTH cum suis Geniis. Adduntur Sigilla et Nomina Eorum

This is an account of the cosmic process so far as it is indicated by the Tarot Trumps.

Liber CCCLXX

Liber A’ASH Vel Capricorni Pneumatici Sub Figura CCCLXX

Contains the true secret of all practical magick.

Liber CD

Liber TAV Vel Kabbalæ Trium Literarum Sub Figura CD

A graphic interpretation of the Tarot on the plane of initiation.

Liber DCCCCXII

Vel Ararita Sub Figura DLXX

This book is an account of the Hexagram and the method of reducing it to the Unity, and
Beyond.
 

Liber CMLXIII

The Treasure House of Images

Only the note attached pertains to Class A. For the rest, please check Class B documents.