Noted photographer E.O. Beaman is a mystery with regard to his Yellowstone photos. Originally a New York landscape photographer, who became an official USGS photographer in 1871, he was on his own by 1872. He is most famous for being the photographer on the J.W. Powell U.S. Geological Survey and he made a number of views of the 1876 Centennial Exposition of Philadelphia. So where are Beamanís Yellowstone photos?
Where Yellowstone is concerned, all that is known of him is that in early 1874, he exhibited in the east "by means of a powerful oxy-hydrogen stereopticon, views taken by himself...of the great Yellow-Stone Basin." Beaman's trip to the Park probably occurred in 1873.
To date, none of Beamanís Yellowstone stereoviews have turned up in any private collections. If they still exist, they are most likely single views (no mass production), and are probably all together as a group.