Geologic map of Mount Spurr.
Credit: This image is found in Miller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report OF 98-0582, 104 p.,Use Restriction: Please cite Miller and others (1998) and Nye (1987) when using this image.
Full Resolution.