The Giannonatti Ranch, in Harding County, South Dakota near Ludlow, includes 10 structures dating from around 1900. A portion of the ranch was listed on the National Register of Historic Places in 1987.
It is located on the south side of an east-west section road about east of Ludlow.
Six of the structures are contributing buildings, one is a contributing structure, the rest were deemed not to contribute to the historic character of the property. With
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