U.S. Geological Survey - Twin Bridges, Montana, N4530-W11215/15

Washington, DC: U.S. Geological Survey, 1960. Color topographic map. 15 Minute Series. 21" x 17". With fold creases from having been used for geothermal research. Provenance: GeothermEx, a Schlumberger Company. Some maps are also annotated. .

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