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11. Arctic Ice Chart, December 15, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 15, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

12. Arctic Ice Chart, December 22, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 22, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

13. Arctic Ice Chart, December 29, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 29, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

14. Arctic Ice Chart, December 8, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for December 8, 1968. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

15. Arctic Ice Chart, February 11, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 11, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

16. Arctic Ice Chart, February 18, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 18, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

17. Arctic Ice Chart, February 25, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 25, 1968. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).

18. Arctic Ice Chart, February 4, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for February 4, 1968. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

19. Arctic Ice Chart, January 14, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for January 14, 1968. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).

20. Arctic Ice Chart, January 21, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for January 21, 1968. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).