Thank you, Graham, for sharing this. There are several other photographs from the same series, taken probably in the summer of 1875. These may be from the photographer who came for the Black Hills Treaty council.
This is a view of the front of the Red Cloud Agency. We knew of this image before, but others in the series are new!
In this next image, the photographer catches the corner of the agent's house on the right edge and looks across the agency compound toward the offices, which includes a meeting room where Saville and Oglala leaders often met.
And in this image, the photographer is looking further to his left towards the warehouse where the rations and annuity goods were stored. You can barely see the top of the two story bastion on the other side.
And according to the employee ledger for the Red Cloud Agency, Michael Dunn served as the chief herder from 20 Apr 1875 to 16 Aug 1876. Joseph Kamen as the agency farmer until 30 Sept 1876; and Martin Gibbon served as storekeeper from 10 Dec 1874 to some time in 1875.