Mary Colter (right) shows a blueprint to the wife of Interior Secretary Harold Ickes at Grand Canyon National Park, ca. 1935. Courtesy National Park Service (16940).

Mary Colter (right) shows a blueprint to the wife of Interior Secretary Harold Ickes at Grand Canyon National Park, ca. 1935. Courtesy National Park Service (16940).

Mary Colter (right) shows a blueprint to the wife of Interior Secretary Harold Ickes at Grand Canyon National Park, ca. 1935. Courtesy National Park Service (16940).

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