Sowers, Thomas, Amherst, Jeffery Amherst, Baron, and Royal United Services Institute for Defence and Security Studies. "A SKETCH of LAKE ONTARO between OSWEGO and NIAGARA and from thence up the River to the upper End of the Carrying Place." Map. Place of production not identified: Thomas Sowers Eng.r,, [ca. 1758]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:hx11z130c (accessed April 25, 2024).