| John Wesley Powell Photographs / G14642b Grand Canyon National Park Museum Collection FROM JOHN WESLEY POWELL'S SECOND EXPEDITION. "THE BOATS IN MARBLE CANYON. A NOONDAY REST." Circa 1872 |
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| John Wesley Powell Photographs / G14642b Grand Canyon National Park Museum Collection FROM JOHN WESLEY POWELL'S SECOND EXPEDITION. "THE BOATS IN MARBLE CANYON. A NOONDAY REST." Circa 1872 |
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