Who created "Rainbow over the Grand Canyon of the Yellowstone"?

Rainbow over the Grand Canyon of the Yellowstone was created by Thomas Moran in 1900.

What medium is "Rainbow over the Grand Canyon of the Yellowstone"?

Rainbow over the Grand Canyon of the Yellowstone is Painting.

Yes, Rainbow over the Grand Canyon of the Yellowstone is in the public domain and available for free download under CC0 license.

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Thomas Moran, 1900