That's an extremely good idea about reading the original book to compare it to Welles' own adaptations. I can't tell you how many great books I've read mainly because of my interest in Orson Welles, whether it was an adapted radio play, or a film, or a screenplay that never became a film, or just a simple desire on his part to make a film. For example, I read in Leaming's book that he badly wanted to make a film of Joseph Heller's CATCH 22, but couldn't. So, I read the book - imagining it as a Welles film - and was blown away by it. Ditto for Tolstoy's WAR AND PEACE, CARMEN, CRIME AND PUNISHMENT, THE ILIAD and THE ODYSSEY, Dickens' THE PICKWICK PAPERS, Dashiel Hammet's THE GLASS KEY, Twain's HUCKLEBERRY FINN, Tarkington's AMBERSONS and SEVENTEEN, Agatha Christie's MURDER OF ROGER ACKROYD, THE MAN WHO WAS THURSDAY, stories by Dineson, Conrad, John Collier, and many others. These are all great books that I would probably never have bothered to read had they not been connected to Welles in some way, but I'm sure glad I did.
I haven't read the two you mentioned, although I saw the film of COME AND GET IT with Frances Farmer, and I always thought THE CITADEL was one of the better programs in the Campbell series. Maybe I'll check them out sometime. If you're interested, there's a good list of Welles' unrealized projects at
If that doesn't work, just do a Google search on "Unseen Orson Welles".