Map shows Central America railroads and canals, political sub-divisions during the mid-nineteenth century. Includes notes and dates on boundaries and railroads. Insets: [Johnson's Mexico] "Territory and Isthmus of Tehuantapec," [Johnson's Central America] Manzanilla I.," "Aspinwall City, Navy Bay," "City of Panama," "The Nicaragua Route," "Isthmus of Panama," and "Harbor of San Juan de Nicaragua." Relief shown by hachures. Depths shown by soundings. Scale not given.