Vintage 1826 Map of A map of the United States of Mexico : as organized and defined by the several acts of the Congress of that Republic, constructed from a great variety of printed and manuscript documents - Prime meridian: Washington D.C. - Relief shown by hachures. - Available also through the Library of Congress Web site as a raster image. - Includes statistical and distance tables. - "Entered according to Act of Congress, the 10th day of June, 1825, by Mexico