From the record
“The Spade Ranch is a large cattle ranch located in the Sandhills of western Nebraska between the towns of Gordon and Ellsworth. Established in 1888 by Bartlett Richards, the ranch was placed on the National Register of Historic Places in 1980.”
Wikipedia article Spade Ranch (Nebraska), CC BY-SA 4.0.
One of 8 National Register listings published here for Sheridan County · listed in 1980 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service