George, III, King of Great Britain,  and George, IV, King of Great Britain.  "[A map of the southern part of the Lake Champlain, from "Tienderoga fort" to Crown Point]."  Map.  1759.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:hx11z332b (accessed June 25, 2021).