Relief shown by hachures and spot heights. "Reduced and compiled under the direction of Col. J.J. Abert in the Bureau of the Corps of Topl. Engrs. by Lieut. W.H. Emory from the map published in 1842 and from other authorities in 1843. C.B. Graham's Lithy." Shows portages and routes, principal towns, and trading houses. Includes a note on pronunciation of Indian names.