Rama Revealed

Rama II

Arthur C. Clarke

1989

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The Garden of Rama (Rama, #3)

Arthur C. Clarke

1991

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Prelude to Foundation

Isaac Asimov

1988

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2061: Odyssey Three

Arthur C. Clarke

1987

Covers from OpenLibrary

Foundation's Edge

Isaac Asimov

1982

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Nemesis

Isaac Asimov

1989

Covers from OpenLibrary