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Глава 12
Ahlberg, P. E., and J. A. Clack. 2006. A Firm Step from Water to Land.
Bambach, R. K. 2006. Phanerozoic Biodiversity Mass Extinctions.
Clack, Jennifer A. 2002.
Engel, M. S., and D. A. Grimaldi. 2004. New Light Shed on the Oldest Insect.