Lot of 2 books and 2 loose maps related to Geology: Ninth Annual Report of the United States Geological and Geographical Survey of the Territories embracing Colorado and Parts of Adjacent Territories…for the Year 1875, GPO, published 1877, hardcover, original cloth, illustrated throughout with maps, charts and plates / Persifor Frazer, Second Geological Survey of Pennsylvania 1875, Report of Progress in the Counties of York, Adams, Cumberland and Franklin..., published 1877, hardcover, original cloth, illustrated with fold-out maps and charts / (Prepared by) William Blake, Geological Map of the Route Explored by Capt. J. Pope...1854, From the Red River to the Rio Grande..., 11.5 x 25 inches, hand-colored / (Prepared by) William Blake, Geological Section Along the Route Explored by Capt. Jno Pope...1854, from the Rio Grande to the Red River..., 11.5 x 41 inches, hand-colored. Total of 4 items.