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Shadows of Forgotten Ancestors: A Search for Who We Are

by Carl Sagan,Ann Druyan

ISBN 13: 9780345384720

Format: Paperback (528 pages)
Publisher: Ballantine Books
Published: 07 Sep 1993

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Billions & Billions: Thoughts on Life and Death at the Brink of the Millennium

by Carl Sagan

ISBN 13: 9780345379184

Format: Illustrated (320 pages)
Publisher: Ballantine Books
Published: 12 May 1998

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