Montrésor, John,  Frazer, Sir Augustus Simon,  and Royal United Services Institute for Defence and Security Studies.  "A DRAUGHT of the TOWNS of BOSTON and CHARLES TOWN and the Circumjacent Country shewing the Works thrown up by His MAJESTY'S Troops and also those by the Rebels during the Campaign 1775."  Map.  1775.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:hx11z274n (accessed February 29, 2020).