1998. This polygon shapefile contains ice observations in the Arctic region for November 17, 1998. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
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1992. This polygon shapefile contains ice observations in the Arctic region for November 9, 1992. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1993. This polygon shapefile contains ice observations in the Arctic region for November 15, 1993. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1997. This polygon shapefile contains ice observations in the Arctic region for July 1, 1997. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).
1995. This polygon shapefile contains ice observations in the Arctic region for January 16, 1995. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1995. This polygon shapefile contains ice observations in the Arctic region for May 2, 1995. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).
1995. This polygon shapefile contains ice observations in the Arctic region for January 30, 1995. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1991. This polygon shapefile contains ice observations in the Arctic region for March 18, 1991. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1987. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.
1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.