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91. Arctic Ice Chart, September 21, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 21, 1971. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).

92. Arctic Ice Chart, September 23, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 23, 1971. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).

93. Arctic Ice Chart, September 28, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for September 28, 1971. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).

94. Arctic Ice Chart, September 7, 1971

1971. Arctic Climate System (ACSYS). 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).