From the record
“The Robert Weber Round Barn is a round barn located east of Durand, Illinois, United States along Illinois Route 75 in Harrison Township. The Weber barn was constructed in 1917 and features a roof designed and built by the Haas Brothers, who worked on other area round barns.”
Wikipedia article Robert Weber Round Barn, CC BY-SA 4.0.
One of 43 National Register listings published here for Winnebago County · listed in 1984 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service