Thomas Moran's painting "The Chasm of the Colorado," begun in 1873, Oct., and completed in 1874, Apr. It was purchased by Congress in July. Powell had taken Moran to the Powell Plateau and showed the view of the river from the east side
Papers of Otis R. Marston: Still images, 1870-1978. vols. 56-104, Colorado River and tributaries (Grand Canyon to Gulf of California) The Otis Marston Colorado River Collection
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