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        Tourists At Carlsbad Caverns National Park | Ken Burns: The National Parks

        Tourists crowd the entrance of Carlsbad Caverns National Park. The crush of visitors following World War II prompted a park service director to worry that the parks were being "loved to death." In 1956, a ten-year, nearly billion-dollar program was launched to modernize and expand facilities to handle the crowds. Source: Carlsbad Caverns National Park.

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