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I do have the Z-5 books and his others. All great, but unless your interested in serious Golden Dawn material it will not interest you. As you can tell from the title it is solely dedicated to the Z formula. But if that is your bag you cannot do better. Has the Whare Ra versions of the neophyte and zelator rituals which are slightly different from the stella matutina ones. Also a lot of analysis of the rituals and covers the officers and invisible stations as well as goes into depth about the tools involved. Not their construction but their actual use and symbolism which your just not going to find in other texts.
Recommended then? They definitely sound interesting although I don't want to get too caught up in too many texts as I am working through the grades according to L.T Christopher.
Will look out for them on ebay.