Edrick L. Eaton was a prolific publisher of photographs in the Omaha, Nebraska area for over 30 years. He began in 1860 shooting local buildings, area scenery and Indians. His notable series include views of President Ulysses S. Grantís visit to Omaha in 1875 and a fine set showing Harrisburg, Pennsylvania in 1880 (details on his trip there are unknown). Eaton remained in Omaha until at least 1892.
His only known Yellowstone view is shown below. It is unclear if this is an original Eaton photo, or if he purchased it from another photographer. It is quite likely that more Eaton Yellowstone stereoviews exist, although they must be quite scarce.
Untitled view of the Grand Canyon of the Yellowstone.