From the record
“The Lamar Buffalo Ranch is a historic livestock ranch in the Lamar River valley of Yellowstone National Park, in the U.S. state of Wyoming. As an early contribution to the conservation of bison, it was created to preserve one of the last free-roaming American bison (buffalo) herds in the United States.”
Wikipedia article Lamar Buffalo Ranch, CC BY-SA 4.0.
One of 38 National Register listings published here for Park County · listed in 1982 · category: District · built in 1907, rustic architecture, by National Park Service.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service