From the record
“The Douglas County Courthouse and Auditor's Office in Armour, South Dakota was listed on the National Register of Historic Places in 1978.”
Wikipedia article Douglas County Courthouse (South Dakota), CC BY-SA 4.0.
One of 7 National Register listings published here for Douglas County · listed in 1978 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service
