From the record
“Hornaday Camp (24GH362) is a historic campsite located 10 miles (16 km) south of Montana Highway 200 near Sand Springs, Montana. William Temple Hornaday used the site during his 1886 expedition for the Smithsonian Institution to preserve the American buffalo.”
Wikipedia article Hornaday Camp, CC BY-SA 4.0.
One of 1 National Register listings published here for Garfield County · listed in 1991 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service