SUMMERVILLE, a post-village of Rock co., Wisconsin, 15 miles S. E. from Janesville. It contains about 20 dwellings.   [Source: The New and Complete Gazetteer of the United States by Thomas Baldwin and J. Thomas, M.D., ©1854 Lippincott, Grambo & Co., Philadelphia, PA; p. 1123; Courtesy of Kathy Lenerz]