From the record
“The Robert Abell Round Barn, in Logan County near Burnstad, North Dakota, United States, was built in 1942 by Robert Abell. It was listed on the National Register of Historic Places in 1986.”
Wikipedia article Robert Abell Round Barn, CC BY-SA 4.0.
One of 2 National Register listings published here for Logan County · listed in 1986 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service