Date: 1840. Map. Map showing the connection of the coal-field of Allegany with the canal and rail-road improvements of the Potomac. Outline map of western Maryland showing drainage, major roads, cities, and the Baltimore and Ohio Railroad and Canal. A …
Map of A map of the United States in 1840 showing the State and territory boundaries, the Oregon Country jointly controlled by Great Britain and the United States, and the Mexican possessions at the time. The map is color–coded to …
Description: A map of the United States in 1840, showing the frontier line, indicate by the thick black line. The map shows the States east of the frontier of the Mississippi, south of the frontier line in Michigan and Maine, and north of the …