1. Map showing potassium-argon ages from the Mount Katmai and adjacent parts of the Naknek and Afognak quadrangles, Alaska Peninsula, Alaska Yale Public content 1992. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Alaska Distribution Section ; Denver, CO : For sale by Map Distribution. English. Public. Alaska and Alaska Peninsula Region.