Relief shown by hachures. Shows department boundaries, cities, towns, and notable physical features; roads, towns, proposed canals, and proposed railroads across the Isthmus of Tehuantepec on inset. Prime meridians: Greenwich and Washington. Inset: Territory and Isthmus of Tehuantepec. In lower right corner: 56. Probably issued in: Johnson's new illustrated (steel plate) family atlas ... New York : Johnson & Browning, 1862.