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MAP SHOWING POTASSIUM-ARGON AGES FROM THE MOUNT KATMAI AND ADJACENT PARTS OF THE NAKNEK AND AFOGNAK QUADRANGLES, ALASKA PENINSULA, ALASKA
Shew, Nora, and Lanphere, M. A., 1992, Map showing potassium-argon ages from the Mount Katmai and adjacent parts of the Naknek and Afognak quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 2021-E, unpaged, 1sheet, scale 1:250,000.