You searched for: Author Beikman, Helen M. Remove constraint Author: Beikman, Helen M. Place Massachusetts Remove constraint Place: Massachusetts Place United States Remove constraint Place: United States Place Georgia Remove constraint Place: Georgia Place Colorado Remove constraint Place: Colorado Format Shapefile Remove constraint Format: Shapefile
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.).
4. Generalized Glacial Limit Lines with Line Decorations: Geology of the Conterminous United States, 2005
8. Outlines of Major Calderas and Impact Structures: Generalized Geologic Map of the Conterminous United States, 2005
1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which ... Geological Survey (U.S.).