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Ferdinand Hayden's 1868 survey of the Wyoming and adjacent territories was a small, largely ignored survey; but it was important to the history of geology and the American West. The discovery of new material related to Hayden's 1868 survey, including a personal diary of one of the assistants on the survey, James Carson, provides critical information that allows the survey's story to be fully articulated and analyzed for the first time. Most of the expedition's activities took place in southern Wyoming and were closely intertwined with one of the most noteworthy events in U.S. history—the building of the transcontinental railroad....

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