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31. Arctic Ice Chart, June 10, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 10, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

32. Arctic Ice Chart, June 17, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 17, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

33. Arctic Ice Chart, June 24, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 24, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

34. Arctic Ice Chart, June 3, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for June 3, 1968. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

35. Arctic Ice Chart, March 11, 1968

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

36. Arctic Ice Chart, March 18, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for March 18, 1968. The ACSYS Historical Ice Chart Archive presents historica... Arctic Climate System (ACSYS).

37. Arctic Ice Chart, March 25, 1968

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

38. Arctic Ice Chart, March 4, 1968

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

39. Arctic Ice Chart, May 13, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for May 13, 1968. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).

40. Arctic Ice Chart, May 20, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for May 20, 1968. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).