From the record
“The Markham Farmstead near Conde, South Dakota was listed on the National Register of Historic Places in 1990. It is located at the junction of Spink County's County Roads 4 and 7.”
Wikipedia article Markham Farmstead, CC BY-SA 4.0.
One of 22 National Register listings published here for Spink County · listed in 1990 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service