Colton's new railroad & county map of the United States, the Canadas, &c.
Colton, Joseph Hutchins.
New York :  J.H. Colton, 
1862.
Inset: Colton's map of the United States showing the proposed railroad routes to the Pacific Ocean.
The title on the cover reads: Colton's Steel-Plate Map of the United States of America, &c.