I don't know for sure. Charles Robinson III has the ID for the picture, and relates in his text the story of how Mabel Brooks of the Texas State Library found the Oliphant studio pictures looking through old photgraphs.
She took them to a local photogrpaher who printed them. From Oliphant's name on the box she tracked down info on him and found that he was still alive. She interviewed him about the details and backgorund of the photos and the hunt. Through Oliphant, they were able to learn of Emil Oberwetter who was the last survivor of the hunt.
Walter Webb, a Texas historian, contacted him and arranged for an interview who then got both the story and the ID's.
Which was a matter of great fortune and timing, as Oberwetter died shortly thereafter.
Another image from that hunt I really like is this one. Alas, it would be so nice to have a crisp, high resolution version to drink in and digest the details. Anyways Robinson did not list the names on this one, which makes me wonder if Webb got the ID's from Oberwetter as he had on the other or not. Or whether Robinson thought it important to put in. Or whether the editor of Robinson's book did not include it- which has happened to me a number of times.
Yes, it was... snowing.