Image 3. J. H. Colton, "The Isthmus of Panama Showing the Routes of Travel Between Chagres and Panama" on "Colton's Map of the United States, the Canadas, etc". in Colton's Traveler and Tourist's Route-Book Through the United States of America and the Canadas (New York: J.H. Colton, 1854). Newberry Library call number: G833.186