"E. Nogal, Sneeve" [verso caption]
Should this caption be correct, we are looking at Edgar or Ernie [Arthur Earnest] Nogal holding the burro's reins. Charles and Rosetta Metheny Nogal, parents of these two, were early pioneers in Eagle in the late 1800s.
"Sneeve" might be Anthony Sneve, born in 1860 in Norway, who was the homesteader on the West Brush Creek ranch that is now Sylvan Lake State Park. Sneve was "fastidious in his manners and his person. ... Locals remember that Sneve would 'tog up' in suitable finery for his trips to Denver." -- A History of Sylvan Lake State Park, by Kathy Heicher, p. 17. [978.844 H4653]
The burro remains unidentified.