There is Welles information not generally available.
Here's four things that currently exist and would be interesting to see or hear, but are unavaiable. If you can think of others like them, post them here:
1) Merv Griffin's tapes
2) In 1977, OW's appearance at the Orson Welles Theater in Cambridge, Mass. was called "An Evening with Orson Welles." a crude recording of it exists but has never been played for anyone.
3) last year Mayles recorded the "Afterwords" sessions at NY's "Orson's Shadow" there were interviews with: Peter Bogdanovich, Chris Welles Feder, Austin Pendleton and Buck Henry
4) The tapes of the phone conversations between Welles and Roger Hill that the Tarbox family have