Walter (1903-1993) and Esther (Kline) (1903-1992) McElroy were school teachers and longtime residents of the Tri-County Pennsylvania area, where northwestern Chester, southeastern Berks, and northeastern Lancaster counties converge. The McElroys were interested in the local history and families of the this area and they collected materials throughout their lifetimes pertaining to the Tri-County area and its prominent individuals and families, including the Ames and Plank families. McElroy family collection on Tri-County (Pa.) history, circa 19th century-1960s, consists of materials related to the history, people, businesses (and other topics) of Berks, Chester, and Lancaster counties in Pennsylvania. The materials include subject files, newspaper clippings, printed matter, original artworks, photographs, and other materials.