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Walter Alvarez, T. rex and the Crater of Doom (1997)

T. rex and the Crater of Doom is under copyright, but the ebook can be purchased for Kindle or Nook, and can be downloaded from Google books.

You can also access the original scholarly article, co-authored by Walter Alvarez, his father Luis W. Alvarez, Helen V. Michel, and Frank Asaro, here and here.

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