Des Barres, Joseph F. W. (Joseph Frederick Wallet), Knight, John, and John Hunter. "A chart of Delawar River from Bombay Hook to Ridley Creek, with soundings &c taken by Lt. Knight of the Navy." Map. London: J.F.W. Des Barres, 1779. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:z603vv297 (accessed April 25, 2024).