Due to pressure by fans on Asimov to write another book in his Foundation series, he did so with Foundation's Edge (1982) and Foundation and Earth (1986), and then went back to before the original trilogy with Prelude to Foundation (1988) and Forward the Foundation (1992), his last novel.
Due to pressure by fans on Asimov to write another book in his Foundation series, he did so with Foundation's Edge (1982) and Foundation and Earth (1986) and then w,ent back to before the original trilogy with Prelude to Foundation (1988) and Forward the Foundation (1992), his last novel.