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2004. Rikk G. Kvitek, Peter Dartnell, Carrie K. Bretz, Seafloor Mapping Lab, Pacific Coastal and Marine Science Center, and Golden, Nadine E. This line shapefile contains bathymetric contours at 10 meter intervals for the offshore area of San Francisco, California. This layer was generate... Geological Survey (U.S.).
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.).
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.).