George (1896-1972) and Toni (1903-1998) Willison were long-time residents of Malta, New York. They purchased South Hill, the only home ever owned by Katherine Anne Porter, from Porter in 1946. The collection contains letters and cards from Porter to the Willisons concerning South Hill and other aspects of Porter's life. The collection also includes other Porter/Willison-related correspondence, notes, clippings, printed matter, and photographs.