From the record
“The Robert Kirkpatrick Round Barn is a historic building located near Coggon in rural Delaware County, Iowa, United States. It was built in 1919 by Robert Kirkpatrick on his own farm.”
Wikipedia article Robert Kirkpatrick Round Barn, CC BY-SA 4.0.
One of 14 National Register listings published here for Delaware County · listed in 2005 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service