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, and 2001. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This line shapefile represents the federally owned land features (for example, national parkways and wild and scenic rivers) of the United States. ... Environmental Systems Research Institute (Redlands, Calif.).
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1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, and 2008. Environmental Systems Research Institute (Redlands, Calif.) and United States. Bureau of Transportation Statistics. This line shapefile represents rural and urban interstate highways. U.S. National Transportation Atlas Interstate Highways is part of the National ... Environmental Systems Research Institute (Redlands, Calif.).
2001. This polygon shapefile contains ice observations in the Arctic region for August 13, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 14, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 15, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 16, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 17, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 20, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 21, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
2001. This polygon shapefile contains ice observations in the Arctic region for August 22, 2001. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).