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2001. Geological Survey (U.S.). This raster layer is a georeferenced image containing impervious surface data for Puerto Rico and the Virgin Islands. Data are in an Albers Equal-A... Geological Survey (U.S.).
2002, 2003, and 2004. Geological Survey (U.S.). This point shapefile portrays major dams of the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extr... Geological Survey (U.S.).