From the record
“Olsson House and Garage is a site on the National Register of Historic Places located in Ronan, Montana. It was added to the Register on January 15, 2009.”
Wikipedia article Don E. Olsson House and Garage, CC BY-SA 4.0.
One of 9 National Register listings published here for Lake County · listed in 2009 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service