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Origins Reconsidered: In Search of What Makes Us Human

by Richard Leakey, Roger Lewin

ISBN 13: 9780385412643

Format: Hardcover (375 pages)
Publisher: Doubleday
Published: 01 Oct 1992

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The Sixth Extinction: Patterns of Life and the Future of Humankind

by Richard Leakey, Roger Lewin

ISBN 13: 9780385424974

Format: Hardcover (271 pages)
Publisher: Doubleday
Published: 01 Oct 1995

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