Five books, of which the Goetia is the first
The Lemegeton describes its own shape, and the seventy-two spirits everybody knows it for occupy only the first of its five parts. The other four — aerial spirits, the spirits of the 360 degrees of the zodiac, the spirits of the four altitudes, and a book of prayers — are barely read by comparison.
Sources (1)
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Lemegeton
, The Goetia: The Lesser Key of Solomon the King
— Preface, 'The Whole Lemegeton or Clavicula'
“Divided into 5 special Books or parts, viz.: (1) THE FIRST BOOK, or PART, which is a Book concerning Spirits of Evil, and which is termed THE GOETIA OF SOLOMON… (2) THE SECOND BOOK is one which treateth of Spirits mingled of Good and Evil Natures, the which is entitled THE THEURGIA-GOETIA… (3) THE THIRD BOOK, called ARS PAULINA… (4) THE FOURTH BOOK, called ARS ALMADEL SALOMONIS… (5) THE FIFTH BOOK of the Lemegeton is one of Prayers and Orations.”
The book's own table of its parts, quoted from the 1904 edition.