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1971. This polygon shapefile contains ice observations in the Arctic region for September 7, 1971. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1987. This polygon shapefile contains ice observations in the Arctic region for September 7, 1987. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1992. This polygon shapefile contains ice observations in the Arctic region for September 7, 1992. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1998. This polygon shapefile contains ice observations in the Arctic region for September 7, 1998. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 7, 1999. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
2000. This polygon shapefile contains ice observations in the Arctic region for September 7, 2000. 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 September 7, 2001. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1972. This polygon shapefile contains ice observations in the Arctic region for September 8, 1972. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1975. This polygon shapefile contains ice observations in the Arctic region for September 8, 1975. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1978. This polygon shapefile contains ice observations in the Arctic region for September 8, 1978. This polygon shapefile contains ice observations in th... Arctic Climate System (ACSYS).