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571. Arctic Ice Chart, April 8, 1980

1980. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1980. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

572. Arctic Ice Chart, April 8, 1984

1984. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1984. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

573. Arctic Ice Chart, April 8, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

574. Arctic Ice Chart, April 8, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1998. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

575. Arctic Ice Chart, April 8, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1999. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

576. Arctic Ice Chart, April 9, 1973

1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 9, 1973. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

577. Arctic Ice Chart, April 9, 1975

1975. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 9, 1975. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

578. Arctic Ice Chart, April 9, 1978

1978. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 9, 1978. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

579. Arctic Ice Chart, April 9, 1979

1979. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 9, 1979. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

580. Arctic Ice Chart, April 9, 1981

1981. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 9, 1981. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).