Relief shown by hachures and pictorially. In lower left corner: "Bureau Corps T. Engineers. 3rd March 1848. Examined & approved, J.J. Abert, Col. Corps T.E." "Entered according to the act of Congress, in the year 1848, by Curtis B. Graham, in the Clerk's Office of the District of Columbia." Inset: Part of the Valley of Mexico. Includes positions and numbers of troops, and casualty statistics for the battles of Contreras, Churubusco, Molino del Rey, and Chapultepec.