Book excerpt: Deep underground, a mysterious cave of stone tablets has been discovered, and researchers are working frantically to investigate a treasury of Prehistoric American artifacts. In this collection, you will uncover the real stories of six legendary dinosaur leaders. Meet the greatest presidential heroes of ancient history: George Washingdonyx, a baryonyx who led a brave new world ; Thomas Jeffersaurus, the prehistoric pen of the revolution ; Andrew Jaxceratops, a creature from the wild frontier who won over the herd ; Abraham Lincolnator, the humble dinosaur who united the continents ; Theodore Rexevelt, a determined tyrannosaur who clawed his way to the top ; Franklin D. Rex, a savior in Prehistoric America's darkest hour. These are the legendary heroes of Jurassic Classics!