PBA Galleries

[1] 2-250 pp. Two folding lithographed maps [1] Mexican Boundary B. Extract from the Treaty Map of Disturnell of 1847 (23 x 39.2 cm); [2] Mexican Boundary. Sketch A. Referred to in Colonel Graham’s Report (13.6 x 46.9 cm) and folding lithographed chart [1] Barometric Profile of the Route from San Antonio (23.3 x 114 cm). (8vo) 24.2x16 cm (9½x6¼"), modern gilt-lettered green cloth. First Edition.

The map entitled Mexican Boundary B (see Plate 40 in Martin & Martin) delineates the boundary difference that would result from the two different interpretations of the Treaty of Guadalupe Hidalgo vis-à-vis the Disturnell map. The first interpretation was based on strict reference to the lines of longitude and latitude on the map; the second, on actual reference to the landmarks of El Paso and the Rio Grande. The Disturnell map had placed El Paso too far north and west of its actual position. Graham’s maps show that the two interpretations would result in a difference of 5,950 square miles to U.S. territory in an area strategic to mining and railroads.