1976. This polygon shapefile contains ice observations in the Arctic region for September 6, 1976. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
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1986. This polygon shapefile contains ice observations in the Arctic region for September 29, 1986. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for December 16, 1966. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1986. This polygon shapefile contains ice observations in the Arctic region for September 22, 1986. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1985. This polygon shapefile contains ice observations in the Arctic region for October 1, 1985. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for December 23, 1966. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1979. This polygon shapefile contains ice observations in the Arctic region for September 17, 1979. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
2008. 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 lead (Pb) 3... United States. Bureau of Transportation Statistics.
1966. This line shapefile contains ice observations in the Arctic region for November 4, 1966. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for December 30, 1966. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).