This is a book that has been far too long out of the hands of English readers. Previous editions were garbled, incomplete or only available in Latin or Spanish or German. This is *the* magnificent lost source of all of Abramelin, the Goetia, Agrippa - and of most of the entire tradition of Western Ceremonial Magick starts with this book!
This is the native Arab tradition that everyone from Agrippa to Dee to Mathers to Crowley has had to deal with second hand. Brion Gysin had to 'go native' in Morocco to get it first hand, and then in a folk context.