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Title: But be warned, it's pretty technical.
Review: This is a thorough, careful examination of the theories and their supporting evidence about the Permain extinction. That's both the strength and weakness of this book-all sides are presented, but there's a lot of heavy technical reading. I have a decent biology background, and I still found it very heavy going. The book is also a bit dated now, for example it doesn't have much on the asteroid impact theories. Still if you really want to learn about the greatest extinction in the history of life, this is a good place to start.
