From the record
“The Chris Poldberg Farmstead is a collection of historic domestic and agricultural buildings located southeast of Jacksonville, Iowa, United States. It was listed on the National Register of Historic Places in 1991.”
Wikipedia article Chris Poldberg Farmstead, CC BY-SA 4.0.
One of 13 National Register listings published here for Shelby County · listed in 1991 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service