Philadelphia: P.S. Duval & Son, Lith. 1854. Very good. Full title: Geological Map of the Route Explored by Capt. Jno. Pope Corps of Topl. Engrs. Near the 32nd Paraellel of North Latitude, 1854, from the Red River to the Rio Grande. Prepared in the Office of Pacific Rail Road Exploration..... (Item #23989)