Créditos (diapositiva 1 de 2)

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Slide 1, Rawpixel.com/Shutterstock.com; slides 3, 4, 12, Thomas Moran, The Chasm of the Colorado, 1873–74. Smithsonian American Art Museum. Lent by the Department of the Interior Museum. Photo Credit: Smithsonian American Art Museum, Washington, DC/Art Resource, NY; slide 7, National Anthropological Archives, Smithsonian Institution [NAA MS 1795a]; slides 9–11, 15, 16, 68, 69, 81, 84–86, 88, 125 (right), Courtesy National Park Service; slide 14, Courtesy US Department of the Interior/US Geological Survey; slides 14, 188 (right), 192, “The Grand Canyon” by Doc Searls, courtesy Flickr, is licensed under the Creative Commons Attribution 2.0 Generic license, https://creativecommons.org/licenses/by/2.0/;