To clarify: Bogdanovich published a book of interviews with Welles with that title in the early '90s -- but he also created and released a series of audio tapes with many of the actual recordings of the interviews.
Anyway, if you can get a hold of it, I recommend it. Quite the document. The recordings aren't great, but you can hear him and Orson clearly enough. It's like the book, but you're actually hearing it, with all the background noises and the spontaneous laughter and joking among the discussion as well. Orson was quite the raconteur and wit.