Rio Colorado Geologic 1858 Map

This beautiful map was the result of an exploration under the direction of the Office of Explorations and Surveys headed by 1st. Lieut. Joseph C. Ives in 1858. The map was drawn by Frhr. F. W.v. Egloffstein, the topographer to the expedition, who used a unique engraving process that resulted in the stunning rendering of the topographic features.