From the record
“The Roba Ranch is a pioneer ranch located near the small unincorporated community of Paulina in Crook County, Oregon. The ranch is named for George and Mary Roba, sheep ranchers who acquired the property in 1892.”
Wikipedia article Roba Ranch, CC BY-SA 4.0.
One of 6 National Register listings published here for Crook County · listed in 2007 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service