From the record
“The JA Ranch is a historic cattle ranch in the Palo Duro Canyon in Armstrong County, Texas. Founded in 1876 by Charles Goodnight and John George Adair, it is the oldest cattle ranching operation in the Texas Panhandle.”
Wikipedia article JA Ranch, CC BY-SA 4.0.
One of 2 National Register listings published here for Armstrong County · listed in 1966 · category: District · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service