1855. J.H. Colton & Co. (W 113°--W 90°/N 49°--N 32°). Relief shown by hachures. Covers Nebraska extending to the Canadian border and westward to Oregon and Kansas incl... J.H. Colton & Co. (New York).
1854. J.H. Colton & Co. Inset: Vicinity of Milwaukee. Prime meridians: Greenwich and Washington. "Entered according to Act of Congress in the year 1854 by J.H. Colton ... J.H. Colton & Co. (New York).