Des Barres, Joseph F. W. (Joseph Frederick Wallet).  "A plan of Quebec and environs, with its defences and the occasional entrenched camps of the French commanded by Marquis de Montcalm."  Map.  1779.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:7h149v43f (accessed October 15, 2018).