"Geologic Map of Colorado", U.S. Geological Survey (USGS)

This mammoth geological map of the state was completed under the direction of W.C. Mendenhall in partnership with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund. It presents impressive geological detail through a combination of color and pattern, identifying a staggering 157 unique types on the map. The base map provides additional useful information featuring hydrology, railroads, land grants, towns and cities, and more. Includes an inset "Index Map of Colorado" at bottom left. Compiled by W.S. Burbank, T.S. Lovering, E.N. Goddard, and E.B. Eckel. Printed on two sheets and joined. First edition. OCLC locates 6 examples of this edition.

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Condition: A

A very clean and colorful example that has been backed with linen and mounted on rollers. There is a small tear confined to the top blank margin and minor wear to the rollers.