From the record
“The Headquarters Park Historic District encompasses the summer headquarters for the Leo Sheep Company, which focused on wool production, and the Rocky Mountain Sheep Company, which concentrated on lamb production, in Carbon County, Wyoming. The area was one of the major summer sheep and lamb-herding regions of Wyoming.”
Wikipedia article Headquarters Park Historic District, CC BY-SA 4.0.
One of 43 National Register listings published here for Carbon County · listed in 2012 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service