John (Jack) K. Hillers at work as photographer on the Aquarius Plateau in July 1875. Utah.
USGS Earth Science Photographic Archive digital file:hjk00809

The caption (above) suggests the picture was taken in 1875, possibly by "Prof" Thompson or J. K. Gilbert during an expedition to retrace the route of the 1872 journey to the mouth of the Dirty Devil River. Another version of the same image attributes the photo to James Fennemore in the spring of 1872 during the Thompson Expedition.

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