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3rd Book Life, the Universe and Everything
(summer 1982)
»This was not based on anything that has already been heard or seen on radio or television. In fact it flatly contradicted episodes 7, 8, 9, 10, 11 and 12 of the radio series.« (Adams 2020, xi)
4th Book So Long, and Thanks for All the Fish
(autumn 1984)
»[…] it effectively contradicted everything to date, up to and including itself« (Adams 2020, xii)
Sources:
• Adams, Douglas: A Guide to the Guide. Some unhelpful remakrs from the author, in: Adams, Douglas: The Ultimate Hitchhiker’s Guide to the Galaxy. A Trilogy in Five Parts [1995], Pan Books: London 2020 [978-1-5290-5143-8], vii–xii.
5th Book Mostly Harmless
(1992)
6th Book And Another Thing…
(by Eoin Colfer; 2009)