Gray's Atlas Map of the United States Showing the Principal Geological Formations by Cha's. H. Hitchcock, Ph.D. Professor of Geology in Dartmouth College. 1873. | Gray's Atlas Of The United States, With General Maps Of The World. Accompanied By Descriptions Geographical, Historical, Scientific and Statistical. By O.W. Gray, Civil And Topographical Engineer, No. 10 North Fifth Street, Philadelphia. Published By Stedman, Brown & Lyon, No. 10 North Fifth Street, Philadelphia. 1873. (on verso) Entered ... 1873, by O.W. Gray ... Washington. | First edition. Has same basic set of maps as the National Atlas and the Continental Atlas. Maps taken from Colton and Frank Gray (for example, Colton's single page Texas map from the 1856 World Atlas, updated). It is odd to see the Colton single page state maps from the 1856 edition atlas here reissued and updated almost twenty years later. Has an extra New Railroad and County Map of the States of Oregon, California and Nevada, in addition to the regular California/Nevada Map. There is also a business directory for San Francisco and Chicago. We believe this indicates that this edition was made for the west coast market; other editions used other regional maps, depending on the market. Maps are in full color.Atlas is bound in half leather dark green cloth covered boards stamped with "Gray's Atlas Of The United States And General Maps Of The World With Descriptions." in gilt; the spine reads "Gray's Atlas Of The United States."