I guess this is a continueation of the "Whats with Magicians and PDF's Nowdays" thread I made. Like most of you know, I prefer an actual book over a pdf. However, as many have mentioned, sometimes money issues and whatnot may prevent me from getting the actual book, so I keep the pdf and read it to see if it is worth having as a book.
Anyway, there are some PDFS that I have found over the years and kept that I always seem to go back to, so much that I think about buying them in book form.
What are some PDF's you treasure?
Mine:
Practical Sigil Magick by Frater UD
Middle Piller by Israel Regardie (Sad I know, I should buy the book!)
Short Course in Scrying ( Thanks Vovin for heads up!)