“Lower Bridge on Schuylkill at Gray’s Ferry,” in Kathleen A. Foster, “Captain Watson’s Travels in America: The Sketchbooks and Diary of Joshua Rowley Watson, 1772-1818” (Philadelphia: University of Pennsylvania Press, 1997). Original at the New York Historical Society. Posted at WEST PHILADELPHIA COMMUNITY HISTORY CENTER: The Building of West Philadelphia: 18th Century Landscape & Settlement Patterns, 2005-08.