From the record
“The Pocasset Gymnasium, in Pocasset, Oklahoma, was built as a Works Progress Administration project in 1940. It was listed on the National Register of Historic Places in 1996.”
Wikipedia article Pocasset Gymnasium, CC BY-SA 4.0.
One of 12 National Register listings published here for Grady County · listed in 1996 · category: Building · built in 1940.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service