29 x 36 cm. Relief shown by hachures. Prime meridians: Greenwich and Washington. "Entered according to act of Congress in the year 1855 by J.H. Colton & Co. in the Clerk's Office of the Dist. Office of the U.S. for the Southern. Dist. of New York." Hand colored. Decorative border. Atlas p. number in lower-right margin: 67. Shows routes of explorers, proposed railroad routes, wagon route, mail route, Indian reserves and mines. On verso: History and statistical view of Mexico. Original publisher: J.H. Colton.

An image showing an aerial view of Boulder City. The outlines of the small city are distinctively marked by the stark contrast between the city's greenery and the surrounding desert. In the far distance, the shores of Lake Mead can be seen peaking out from behind the mountains.