Amherst, Jeffery Amherst, Baron, and Royal United Services Institute for Defence and Security Studies. "[An unfinished chart of the Saint Lawrence River from Perrot Island to the Island of Orleans]." Map. Place of production not identified: producer not identified, [1759]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:hx11z082x (accessed April 24, 2024).