English: Yellowstone National Park, Wyoming. Survey party, with pack train, en route upon the trail between the Yellowstone River and East Fork, showing the manner in which all parties traverse these wilds. 1871.U.S. Geological and Geographical Survey of the Territories (
Hayden Survey). Photo by Jackson, W.H.
{{Information |Description={{en|1=Yellowstone National Park, Wyoming. Survey party, with pack train, en route upon the trail between the Yellowstone River and East Fork, showing the manner in which all parties traverse these wilds. 1871.U.S. Geological an
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