Absolute Key to Occult Science: The Tarot of the Bohemians; The Most Ancient Book in the World; For the Exclusive Use of Initiates. E-book. Formato PDF Papus   -  Forgotten Books, 2017  - 

The key to its construction and application has not yet been revealed, so far as I know. I therefore wished to fill up this deficiency by supplying Initiates, those who are acquainted with the elements of occult science, with an accurate guide, which would assist them in the pursuit of: their studies.