From the record
“The Bell Ranch is a historic ranch in San Miguel County, New Mexico, near Tucumcari. Owned by John Malone since 2010, it is one of the largest privately owned ranches in the United States.”
Wikipedia article Bell Ranch, CC BY-SA 4.0.
One of 104 National Register listings published here for San Miguel County · listed in 1970 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service