1993. This polygon shapefile contains ice observations in the Arctic region for October 4, 1993. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
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1995. This polygon shapefile contains ice observations in the Arctic region for October 16, 1995. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1995. This polygon shapefile contains ice observations in the Arctic region for September 11, 1995. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1997. This polygon shapefile contains ice observations in the Arctic region for June 3, 1997. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).
1971. 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 carbon mono... United States. Bureau of Transportation Statistics.
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 carbon mono... United States. Bureau of Transportation Statistics.
1999. This polygon shapefile contains ice observations in the Arctic region for September 15, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 16, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 17, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 20, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).