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In the summer of 1902, a small crew of fossil hunters from the American Museum of Natural History left New York in search of dinosaur bones. Acting on a tip from the noted conservationist William Temple Hornaday, they ventured to a remote part of Montana with exposed rocks from the Cretaceous period known as the Hell Creek Formation. Although they were primarily looking for Triceratops bones, it was not long before something else caught their attention. As the young men gradually unearthed their discovery using dynamite and a heavy metal scraper dragged by a horse, it became clear...

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