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Ceremonial Magick: "#Goetia: The Lesser Key of Solomon: The Initiated Interpretation of #Ceremonial #Magic," by S.L. MacGregor Mathers and Aleister Crowley. A complete book of magickal symbols and sigils, by two of the most prominent and influential occultists of all time. The "Lesser Key" contains the magickal sigils of the 72 "Goetia," spirits that can be called upon by the Adept to perform actions on the astral plane.