Railroad Map of the United States.

This detailed map, titled Railroad Map of the United States, was made by Henry F. Walling and presents a striking visual of the nation's expanding railroad network during the mid-19th century. Originally published in Comstock & Cline's Atlas of New Hampshire, the map reflects the significant role Walling played in American topographical surveying, with the work executed under his supervision. It showcases the intricate web of existing railroad lines that connected major cities and regions, symbolizing the transformative power of rail travel in unifying distant parts of the country.