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- Billion Years of Life on Earth. New York: Alfred A. Knopf. p. 129. ISBN 978-0-375-40119-0. Mitchell, C. E.; Melchin, M. J.; Cameron, C. B.; Maletz, J. R. (2012)...16 KB (1,232 words) - 01:22, 25 October 2024
- Years of Life on Earth. New York: Alfred A. Knopf. pp. 146–7. ISBN 978-0-375-40119-0. Lomax, Dean; Lamsdell, James; Ciurca, Samuel (2011-01-01). "A collection...27 KB (3,087 words) - 21:13, 4 October 2024