You searched for: Author Beikman, Helen M. Remove constraint Author: Beikman, Helen M. Author Schruben, Paul G. Remove constraint Author: Schruben, Paul G. Author Arndt, Raymond E. Remove constraint Author: Arndt, Raymond E. Place Massachusetts Remove constraint Place: Massachusetts Place Delaware Remove constraint Place: Delaware Place Colorado Remove constraint Place: Colorado Place Arkansas Remove constraint Place: Arkansas Place Alabama Remove constraint Place: Alabama Data type Polygon Remove constraint Data type: Polygon
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. This layer is part of the Geologic Map of the ... Geological Survey (U.S.).
1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States... Geological Survey (U.S.).