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Discovery and Exploration

Geographic Locations

United States--Texas.
United States--Texas--Red River.
United States--Utah.
United States--Utah--Green River.
United States--Virginia.
United States--Washington (State)
United States--West.
United States--Wyoming--Green River.
United States--Yellowstone River.
United States--Yellowstone River Watershed.
Venezuela.
West Indies.
Western Hemisphere.

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