Donald Cotton
From Tardis Wiki, the free Doctor Who reference
Donald Cotton (26 April 1928-28 December 1999) wrote the Doctor Who serials The Myth Makers and The Gunfighters. He also wrote the Target Books novelisations of the two stories, as well as The Romans.
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Note: I do apologize for the quality of that image, if anyone can get a better resolution from it, I'd be very grateful (Vincent VG)