   
  LEFT: Thomas Moran, Gardiner River, 1871, Department of the Interior, National Park Service, Yellowstone National Park RIGHT: Thomas Moran, Sand in the Canyon, 1871, Department of the Interior, National Park Service, Yellowstone National Park During the next two months he produced dozens of watercolor studies that would serve as the basis for numerous paintings. The field sketches completed during this trip were the first color images of Yellowstone ever seen in the East.
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