Amherst, Jeffery Amherst, Baron, and Royal United Services Institute for Defence and Security Studies. "GRAND PORTAGE from the RIVER S.T LAURENCE to the LAKE TEMESCOUATA, 35 Miles." Map. Place of production not identified: producer not identified, [1759?]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:hx11z080c (accessed April 20, 2024).