Valancourt are now planning to reissue these out of print titles –

Man Without a Shadow (intro by Colin Stanley)
World of Violence (intro by Nicolas Tredell)
God of the Labyrinth (intro by Gary Lachman)
Ritual in the Dark and The Philosophers’ Stone are now available in paperbacks and as ebooks from Amazon.

Meanwhile, here’s an interesting piece on CW from The Independent in their Invisible Ink Series. “The problem, it would seem, is that his conceptually-oriented mind has kept him from mainstream popularity”.