"Map of a Reconnaissance Between Baltimore and Philadelphia exhibiting the several routes of the Mail Road contemplated by the resolution of Congress approved on the 4th of May 1826", U.S. Corps of Engineers
Fascinating map issued by S. Bernard, Brigr. Genl. and William Tell Poussin, Capt. Top. Engrs, both of the Board of Internal Improvement. It provides a detailed picture of a strip of land 27 miles wide between the cities on a scale of three miles to the inch. Filled with historical details including noting a copper factory, forts, ferries, mills, etc. Some roads are named and all are identified as projected, traveled or turnpikes.