I was looking for something else today—a book that might have been one of Pynchon’s sources for the Kabbalah stuff in Gravity’s Rainbow—when I came across this Penguin edition, Witchcraft and Sorcery, 1970, ed. Max Marwick. (I found a Pynchonian connection—easy to do, I know—when I opened the book to an essay entitled “Witchcraft amongst the Germanic and Slavonic Peoples”).
Biblioklept 
If you find, or already have any sources, of Pynchon’s research for the book, please post; very interested.
LikeLike
A simple one to find (you can find it online; I picked it up for $2) is A.E. Waite’s Pictorial Key to the Tarot:
Click to access Waite_Pictorial_Key_to_the_Tarot.pdf
LikeLike
Cheers!
LikeLike