More famous exponents of the art of the altered book

Playwright Joe Orton and Kenneth Halliwell were jailed after improving over 70 books from Islington Library. They are now in the Islington Council archives but I can't find a link to show you what they looked like.

While searching for references to Joe Orton I came across this article by Suzanne Nielson Joe Orton: Cleansed or Condemned by Maniacal Rage.