1976. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 1976. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
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1979. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 1979. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1981. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 1981. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1990. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 1990. 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 23, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
2001. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 2001. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
2002. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 23, 2002. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 24, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 24, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).