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.).
Search Results
1990. This polygon shapefile contains ice observations in the Arctic region for July 30, 1990. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for June 18, 1990. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for July 23, 1990. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for July 16, 1990. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for May 7, 1990. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).
1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.
1990. This polygon shapefile contains ice observations in the Arctic region for August 13, 1990. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for October 15, 1990. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for December 3, 1990. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).