Philadelphia. [ 1851]. Single-sheet map, 12 x 18 inches. Very good. Item #WRCAM15130
The map depicts the region between the Rio Grande and the Colorado River, with forts and towns marked, mainly intended to illustrate the error made by Bartlett in setting the line from the Rio Grande to the Continental Divide too far north, resulting in a 5950 square mile area being on the wrong side of the border. Graham shows the correct location further south. This correction was the cause of a major falling out between Bartlett and his fellow surveyors. This map originally appeared in the report of the Secretary of the Interior for 1851. MARTIN & MARTIN 40.