From the record
“The Old Oxford Mill near Oxford, Kansas was built in 1875. It was listed on the National Register of Historic Places in 1982.”
Wikipedia article Old Oxford Mill, CC BY-SA 4.0.
One of 10 National Register listings published here for Sumner County · listed in 1982 · category: Building · built in 1876.
Sources: the Wikipedia article · the National Register database, National Park Service