I realize this is a really, super long shot, but it never hurts to ask...
When Harry Stork died in 1907, his notebooks went to J. N. Hilliard. In "Greater Magic", Hilliard mentions that he was planning on writing a book on Stork based on these notebooks. That book, obviously, was never written. Does anyone here have any clue as to what may have happened to these notebooks upon Hilliard's death?