2012. Rukstales, Kenneth S. (compiler). This polygon shapefile represents seismic hazards in the United States. The data represent a model showing the probability that ground motion will ... National Atlas of the United States.
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2012. United States. Bureau of Transportation Statistics, United States. Department of Transportation. Research and Innovative Technology Administration, and United States. Bureau of the Census. State boundaries with political limit - boundaries extending into the ocean. The State Boundary with Detailed Shorelines database was created using... U.S. Census Bureau (BOC).