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King, Philip B.. Arndt, Raymond E.. Schruben, Paul G.. Bawiec, Walter J.. Beikman, Helen M.. (2005). Outlines of Major Calderas and Impact Structures: Generalized Geologic Map of the Conterminous United States, 2005. [Shapefile]. Geological Survey (U.S.). https://purl.stanford.edu/cn501pk8752