T. rex and the Crater of Doom
By: Alvarez, WalterPrice: $16.95
Princeton University Press, Princeton, NJ, 1997. The story of the discovery of the impact that caused mass extinctions, especially of the dinosaurs, at the end of the Cretaceous. The crater was discovered in the Yucatan, and traces of iridium at the Cretaceous-Tertiary boundary were found worldwide. Paperback, 185 pages.

