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1. Arctic Ice Chart, April 1, 1966

1966. Arctic Climate System (ACSYS). This line shapefile contains ice observations in the Arctic region for April 1, 1966. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).

2. Arctic Ice Chart, April 1, 1967

1967. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1967. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

3. Arctic Ice Chart, April 1, 1968

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

4. Arctic Ice Chart, April 1, 1970

1970. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1970. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

5. Arctic Ice Chart, April 1, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1971. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

6. Arctic Ice Chart, April 1, 1974

1974. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1974. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

7. Arctic Ice Chart, April 1, 1977

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1977. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

8. Arctic Ice Chart, April 1, 1982

1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1982. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

9. Arctic Ice Chart, April 1, 1984

1984. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1984. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

10. Arctic Ice Chart, April 1, 1985

1985. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1985. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

11. Arctic Ice Chart, April 1, 1986

1986. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1986. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

12. Arctic Ice Chart, April 1, 1996

1996. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1996. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

13. Arctic Ice Chart, April 1, 1997

1997. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1997. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

14. Arctic Ice Chart, April 1, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1998. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

15. Arctic Ice Chart, April 10, 1972

1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

16. Arctic Ice Chart, April 10, 1980

1980. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1980. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

17. Arctic Ice Chart, April 10, 1985

1985. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1985. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

18. Arctic Ice Chart, April 10, 1989

1989. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1989. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

19. Arctic Ice Chart, April 10, 1995

1995. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 10, 1995. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

20. Arctic Ice Chart, April 11, 1969

1969. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 1969. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

21. Arctic Ice Chart, April 11, 1988

1988. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 1988. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

22. Arctic Ice Chart, April 11, 1994

1994. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 1994. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

23. Arctic Ice Chart, April 11, 2000

2000. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 11, 2000. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

24. Arctic Ice Chart, April 12, 1973

1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

25. Arctic Ice Chart, April 12, 1977

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1977. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

26. Arctic Ice Chart, April 12, 1978

1978. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1978. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

27. Arctic Ice Chart, April 12, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 12, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

28. Arctic Ice Chart, April 13, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1971. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

29. Arctic Ice Chart, April 13, 1972

1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

30. Arctic Ice Chart, April 13, 1976

1976. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1976. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

31. Arctic Ice Chart, April 13, 1982

1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1982. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

32. Arctic Ice Chart, April 13, 1987

1987. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1987. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

33. Arctic Ice Chart, April 13, 1992

1992. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1992. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

34. Arctic Ice Chart, April 13, 1993

1993. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1993. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

35. Arctic Ice Chart, April 13, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

36. Arctic Ice Chart, April 13, 2000

2000. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 13, 2000. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

37. Arctic Ice Chart, April 14, 1975

1975. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 14, 1975. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

38. Arctic Ice Chart, April 14, 1980

1980. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 14, 1980. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

39. Arctic Ice Chart, April 14, 1997

1997. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 14, 1997. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

40. Arctic Ice Chart, April 14, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 14, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

41. Arctic Ice Chart, April 14, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 14, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

42. Arctic Ice Chart, April 15, 1966

1966. Arctic Climate System (ACSYS). This line shapefile contains ice observations in the Arctic region for April 15, 1966. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).

43. Arctic Ice Chart, April 15, 1967

1967. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1967. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

44. Arctic Ice Chart, April 15, 1968

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

45. Arctic Ice Chart, April 15, 1970

1970. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1970. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

46. Arctic Ice Chart, April 15, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1971. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

47. Arctic Ice Chart, April 15, 1978

1978. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1978. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

48. Arctic Ice Chart, April 15, 1984

1984. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1984. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

49. Arctic Ice Chart, April 15, 1986

1986. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1986. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

50. Arctic Ice Chart, April 15, 1996

1996. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1996. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

51. Arctic Ice Chart, April 15, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

52. Arctic Ice Chart, April 15, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

53. Arctic Ice Chart, April 16, 1973

1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 16, 1973. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

54. Arctic Ice Chart, April 16, 1974

1974. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 16, 1974. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

55. Arctic Ice Chart, April 16, 1985

1985. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 16, 1985. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

56. Arctic Ice Chart, April 16, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 16, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

57. Arctic Ice Chart, April 16, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 16, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

58. Arctic Ice Chart, April 17, 1972

1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

59. Arctic Ice Chart, April 17, 1975

1975. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1975. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

60. Arctic Ice Chart, April 17, 1979

1979. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1979. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

61. Arctic Ice Chart, April 17, 1980

1980. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1980. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

62. Arctic Ice Chart, April 17, 1989

1989. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1989. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

63. Arctic Ice Chart, April 17, 1990

1990. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1990. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

64. Arctic Ice Chart, April 17, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 17, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

65. Arctic Ice Chart, April 18, 1969

1969. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1969. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

66. Arctic Ice Chart, April 18, 1974

1974. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1974. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

67. Arctic Ice Chart, April 18, 1977

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1977. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

68. Arctic Ice Chart, April 18, 1983

1983. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1983. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

69. Arctic Ice Chart, April 18, 1988

1988. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1988. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

70. Arctic Ice Chart, April 18, 1994

1994. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1994. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

71. Arctic Ice Chart, April 18, 1995

1995. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 18, 1995. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

72. Arctic Ice Chart, April 19, 1971

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 19, 1971. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

73. Arctic Ice Chart, April 19, 1978

1978. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 19, 1978. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

74. Arctic Ice Chart, April 19, 1979

1979. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 19, 1979. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

75. Arctic Ice Chart, April 19, 1982

1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 19, 1982. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

76. Arctic Ice Chart, April 19, 1993

1993. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 19, 1993. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

77. Arctic Ice Chart, April 19, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 19, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

78. Arctic Ice Chart, April 2, 1973

1973. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1973. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

79. Arctic Ice Chart, April 2, 1979

1979. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1979. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

80. Arctic Ice Chart, April 2, 1981

1981. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1981. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

81. Arctic Ice Chart, April 2, 1990

1990. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1990. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

82. Arctic Ice Chart, April 2, 1991

1991. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

83. Arctic Ice Chart, April 2, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 2, 1998. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

84. Arctic Ice Chart, April 20, 1970

1970. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 20, 1970. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

85. Arctic Ice Chart, April 20, 1972

1972. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 20, 1972. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

86. Arctic Ice Chart, April 20, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 20, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

87. Arctic Ice Chart, April 20, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 20, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

88. Arctic Ice Chart, April 21, 1975

1975. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1975. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

89. Arctic Ice Chart, April 21, 1977

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1977. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

90. Arctic Ice Chart, April 21, 1980

1980. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1980. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

91. Arctic Ice Chart, April 21, 1981

1981. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1981. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

92. Arctic Ice Chart, April 21, 1986

1986. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1986. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

93. Arctic Ice Chart, April 21, 1987

1987. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1987. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

94. Arctic Ice Chart, April 21, 1992

1992. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1992. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

95. Arctic Ice Chart, April 21, 1997

1997. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1997. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

96. Arctic Ice Chart, April 21, 1998

1998. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1998. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

97. Arctic Ice Chart, April 21, 1999

1999. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 21, 1999. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

98. Arctic Ice Chart, April 22, 1966

1966. Arctic Climate System (ACSYS). This line shapefile contains ice observations in the Arctic region for April 22, 1966. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).

99. Arctic Ice Chart, April 22, 1967

1967. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 22, 1967. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).

100. Arctic Ice Chart, April 22, 1968

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