2061: Odyssey Three

3001: The Final Odyssey

Arthur C. Clarke

1997

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Prelude to Foundation

Isaac Asimov

1988

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Rama II

Arthur C. Clarke

1989

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Foundation's Edge

Isaac Asimov

1982

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Foundation and Earth

Isaac Asimov

1986

Covers from OpenLibrary

Nemesis

Isaac Asimov

1989

Covers from OpenLibrary