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Start Over Place United States. Virgin Islands Subject Biology and Ecology Publisher National Atlas of the United States
2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.
2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.
1992 and 1993. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.
1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.
1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, and 2005. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.