Jefferys, Thomas, -1771. "An exact chart of the river St. Laurence, from Fort Frontenac to the island of Anticosti shewing the soundings, rocks, shoals &c with views of the lands and all necessary instructions for navigating that river to Quebec." Map. London: Thos. Jefferys, [1768]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:q524nh872 (accessed April 25, 2024).