| John Wesley Powell Photographs / G14772 Grand Canyon National Park Museum Collection MARBLE CANYON WITH JOHN WESLEY POWELL'S BOAT, EMMA DEAN. FROM THE SECOND EXPEDITION. 20 August 1872 |
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| John Wesley Powell Photographs / G14772 Grand Canyon National Park Museum Collection MARBLE CANYON WITH JOHN WESLEY POWELL'S BOAT, EMMA DEAN. FROM THE SECOND EXPEDITION. 20 August 1872 |
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