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 Center,  https://collections.leventhalmap.org/search/commonwealth:7h149v43f (accessed November 18, 2017).