Title: Hanging Rock, Gulph Mills (1900) Abstract: On the way to Valley Forge Keywords: American Revolution/Hanging Rock/Valley Forge Source: Lower Merion Historical Society Archives Binder: 4 Collection: W. Robert Swartz This photo and many others may be found in The First 300: The Amazing and Rich History of Lower Merion, which may be purchased through Diane Publishing Company or in Lower Merion area book stores.