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1982. This polygon shapefile contains ice observations in the Arctic region for April 13, 1982. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1987. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1987. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1992. This polygon shapefile contains ice observations in the Arctic region for April 13, 1992. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1993. This polygon shapefile contains ice observations in the Arctic region for April 13, 1993. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for April 13, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
2000. This polygon shapefile contains ice observations in the Arctic region for April 13, 2000. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1975. This polygon shapefile contains ice observations in the Arctic region for April 14, 1975. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1980. This polygon shapefile contains ice observations in the Arctic region for April 14, 1980. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1997. This polygon shapefile contains ice observations in the Arctic region for April 14, 1997. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 14, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).