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I found this while searching for audiobooks. It's from Wired for Books and contains a couple of interviews with Douglas Adams, one from 1983 and one from 1989. Although the interviews are old and a lot of the events that they talk about are obviously out of date I think they give a good insight into Douglas Adams and are well worth a listen. You'll need real player to stream them and just under an hour free to sit and listen to them.