Amherst, Jeffery Amherst, Baron, and Royal United Services Institute for Defence and Security Studies. "Sketch of the Isthmus to the NE of Crown Point." Map. Place of production not identified: Producer not identified, [1759]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:hx11z1824 (accessed April 24, 2024).