From the record
“The George and Susan Guiberson Armstrong House is a historic residence located north of Winterset, Iowa, United States. George Armstrong was a native of Ireland who settled with his wife Susan in Madison County in 1853.”
Wikipedia article George and Susan Guiberson Armstrong House, CC BY-SA 4.0.
One of 55 National Register listings published here for Madison County · listed in 1987 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

